Skip to search results Skip to filters Skip to sort Skip to selected filters

Women's Glitter Sandals

78 items found

Sort By

Your Selections

Search Results

Naturalizer - Baylor. Color Silver Glitter. On sale for $62.30. MSRP $89.00.. 4.5 out of 5 stars

Brand Name: Naturalizer
Product Name: Baylor
Color: Silver Glitter
Price: $62.30MSRP: $89.00
Rating: 5Rated 5 stars out of 5(114)

Naturalizer - Luisa. Color Yellow Leather. On sale for $119.95. MSRP $130.00.. 4.3 out of 5 stars

Brand Name: Naturalizer
Product Name: Luisa
Color: Yellow Leather
Price: $119.95MSRP: $130.00
Rating: 4Rated 4 stars out of 5(27)

Touch Ups - Melanie. Color Silver Glitter. Low Stock. $59.95. 4.0 out of 5 stars

8 left in stock

Brand Name: Touch Ups
Product Name: Melanie
Color: Silver Glitter
Price: $59.95
Rating: 4Rated 4 stars out of 5(154)

Touch Ups - Jane. Color Champagne. $65.95. 4.2 out of 5 stars

Brand Name: Touch Ups
Product Name: Jane
Color: Champagne
Price: $65.95
Rating: 4Rated 4 stars out of 5(558)

Jewel Badgley Mischka - Cook. Color Silver Glitter. On sale for $73.04. MSRP $89.00.. 4.3 out of 5 stars

Brand Name: Jewel Badgley Mischka
Product Name: Cook
Color: Silver Glitter
Price: $73.04MSRP: $89.00
Rating: 4Rated 4 stars out of 5(36)

Jewel Badgley Mischka - James. Color Silver Glitter. On sale for $83.30. MSRP $119.00.. 4.2 out of 5 stars

Brand Name: Jewel Badgley Mischka
Product Name: James
Color: Silver Glitter
Price: $83.30MSRP: $119.00
Rating: 4Rated 4 stars out of 5(15)

Jewel Badgley Mischka - Rochel. Color Silver. On sale for $95.88. MSRP $139.00.. 5.0 out of 5 stars

Brand Name: Jewel Badgley Mischka
Product Name: Rochel
Color: Silver
Price: $95.88MSRP: $139.00
Rating: 5Rated 5 stars out of 5(1)

J. Renee - Francie. Color Pewter Glitter. $98.95. 4.1 out of 5 stars

Brand Name: J. Renee
Product Name: Francie
Color: Pewter Glitter
Price: $98.95
Rating: 4Rated 4 stars out of 5(165)

Badgley Mischka - Fenix. Color Silver. Low Stock. On sale for $119.97. MSRP $265.00.. 5.0 out of 5 stars

9 left in stock

Brand Name: Badgley Mischka
Product Name: Fenix
Color: Silver
Price: $119.97MSRP: $265.00
Rating: 5Rated 5 stars out of 5(2)

Stuart Weitzman - Nudistcurve 75 Block Sandal. Color Platino. Low Stock. On sale for $148.50. MSRP $495.00.. 3.4 out of 5 stars

8 left in stock

Gold Stuart Weitzman Nudistcurve 75 Block Sandal

Brand Name: Stuart Weitzman
Product Name: Nudistcurve 75 Block Sandal
Color: Platino
Price: $148.50MSRP: $495.00
Rating: 3Rated 3 stars out of 5(14)

Jewel Badgley Mischka - Rainbow. Color Silver. On sale for $97.51. MSRP $129.00.. 3.5 out of 5 stars

Brand Name: Jewel Badgley Mischka
Product Name: Rainbow
Color: Silver
Price: $97.51MSRP: $129.00
Rating: 4Rated 4 stars out of 5(2)

Badgley Mischka - Frida. Color Silver. On sale for $164.12. MSRP $245.00.. 3.0 out of 5 stars

Brand Name: Badgley Mischka
Product Name: Frida
Color: Silver
Price: $164.12MSRP: $245.00
Rating: 3Rated 3 stars out of 5(1)

Badgley Mischka - Freedom. Color Silver. Low Stock. On sale for $132.27. MSRP $245.00..

6 left in stock

+2 colors/patterns

Brand Name: Badgley Mischka
Product Name: Freedom
Color: Silver
Price: $132.27MSRP: $245.00
Rating

Jewel Badgley Mischka - Joanne. Color Light Gold Glitter. On sale for $76.30. MSRP $109.00.. 4.0 out of 5 stars

Brand Name: Jewel Badgley Mischka
Product Name: Joanne
Color: Light Gold Glitter
Price: $76.30MSRP: $109.00
Rating: 4Rated 4 stars out of 5(14)

Jewel Badgley Mischka - Rayla. Color Rose Gold. On sale for $86.07. MSRP $109.00.. 4.0 out of 5 stars

+2 colors/patterns

Brand Name: Jewel Badgley Mischka
Product Name: Rayla
Color: Rose Gold
Price: $86.07MSRP: $109.00
Rating: 4Rated 4 stars out of 5(3)

Badgley Mischka - Firey. Color Silver. Low Stock. On sale for $116.79. MSRP $198.00.. 1.5 out of 5 stars

6 left in stock

+2 colors/patterns

Brand Name: Badgley Mischka
Product Name: Firey
Color: Silver
Price: $116.79MSRP: $198.00
Rating: 2Rated 2 stars out of 5(2)

Jewel Badgley Mischka - Rita. Color Rose Gold. Low Stock. On sale for $97.30. MSRP $139.00.. 2.5 out of 5 stars

10 left in stock

Brand Name: Jewel Badgley Mischka
Product Name: Rita
Color: Rose Gold
Price: $97.30MSRP: $139.00
Rating: 3Rated 3 stars out of 5(2)

Badgley Mischka - Frankie. Color Pale Gold. Low Stock. On sale for $106.70. MSRP $245.00.. 4.0 out of 5 stars

9 left in stock

Brand Name: Badgley Mischka
Product Name: Frankie
Color: Pale Gold
Price: $106.70MSRP: $245.00
Rating: 4Rated 4 stars out of 5(3)

Badgley Mischka - Ivie. Color Bronze. On sale for $124.72. MSRP $198.00.. 2.0 out of 5 stars

Brand Name: Badgley Mischka
Product Name: Ivie
Color: Bronze
Price: $124.72MSRP: $198.00
Rating: 2Rated 2 stars out of 5(2)

Badgley Mischka - Sally. Color Platino. Low Stock. $234.95. 3.7 out of 5 stars

5 left in stock

Brand Name: Badgley Mischka
Product Name: Sally
Color: Platino
Price: $234.95
Rating: 4Rated 4 stars out of 5(3)

Badgley Mischka - Tess. Color Platino/Platino. Low Stock. On sale for $85.98. MSRP $215.00.. 4.0 out of 5 stars

1 left in stock

Brand Name: Badgley Mischka
Product Name: Tess
Color: Platino/Platino
Price: $85.98MSRP: $215.00
Rating: 4Rated 4 stars out of 5(6)

Reef - Stargazer. Color Gemstone. $31.95. 4.4 out of 5 stars

Brand Name: Reef
Product Name: Stargazer
Color: Gemstone
Price: $31.95
Rating: 4Rated 4 stars out of 5(845)

Reef - Star Cushion. Color Black. $39.95. 4.3 out of 5 stars

Brand Name: Reef
Product Name: Star Cushion
Color: Black
Price: $39.95
Rating: 4Rated 4 stars out of 5(461)

Anne Klein - Armaretta. Color Gold. $88.95. 3.8 out of 5 stars

Brand Name: Anne Klein
Product Name: Armaretta
Color: Gold
Price: $88.95
Rating: 4Rated 4 stars out of 5(9)

FitFlop - Lulu Glitter Toe-Thongs. Color Black Glitter. $80.00. 4.4 out of 5 stars

Brand Name: FitFlop
Product Name: Lulu Glitter Toe-Thongs
Color: Black Glitter
Price: $80.00
Rating: 4Rated 4 stars out of 5(54)

Havaianas - Slim Palette Glow Flip Flop Sandal. Color Peony Rose. $34.00. 4.1 out of 5 stars

Red Havaianas Slim Palette Glow Flip Flop Sandal

Brand Name: Havaianas
Product Name: Slim Palette Glow Flip Flop Sandal
Color: Peony Rose
Price: $34.00
Rating: 4Rated 4 stars out of 5(9)

Touch Ups - Maeve. Color Silver. $74.95. 3.8 out of 5 stars

Brand Name: Touch Ups
Product Name: Maeve
Color: Silver
Price: $74.95
Rating: 4Rated 4 stars out of 5(14)

TKEES - Glitters. Color Gleam. $68.00. 4.0 out of 5 stars

Brand Name: TKEES
Product Name: Glitters
Color: Gleam
Price: $68.00
Rating: 4Rated 4 stars out of 5(35)

Havaianas - Slim Square Glitter Flip Flop Sandal. Color Indigo Blue. $38.00. 4.0 out of 5 stars

Blue Havaianas Slim Square Glitter Flip Flop Sandal

Brand Name: Havaianas
Product Name: Slim Square Glitter Flip Flop Sandal
Color: Indigo Blue
Price: $38.00
Rating: 4Rated 4 stars out of 5(3)

Stuart Weitzman - Aleena 75. Color Silver. Low Stock. On sale for $228.00. MSRP $475.00.. 3.7 out of 5 stars

6 left in stock

Brand Name: Stuart Weitzman
Product Name: Aleena 75
Color: Silver
Price: $228.00MSRP: $475.00
Rating: 4Rated 4 stars out of 5(23)

Touch Ups - Mae. Color Silver. On sale for $66.73. MSRP $74.95.. 2.2 out of 5 stars

Brand Name: Touch Ups
Product Name: Mae
Color: Silver
Price: $66.73MSRP: $74.95
Rating: 2Rated 2 stars out of 5(4)

Havaianas - Slim Sparkle II Flip Flop Sandal. Color Clay. Low Stock. On sale for $26.22. MSRP $38.00.. 3.0 out of 5 stars

5 left in stock

Tan Havaianas Slim Sparkle II Flip Flop Sandal

Brand Name: Havaianas
Product Name: Slim Sparkle II Flip Flop Sandal
Color: Clay
Price: $26.22MSRP: $38.00
Rating: 3Rated 3 stars out of 5(2)

Havaianas - Slim Glitter II Flip Flop Sandal. Color Ballet Rose/Golden Blush. $38.00. 3.7 out of 5 stars

Pink Havaianas Slim Glitter II Flip Flop Sandal

Brand Name: Havaianas
Product Name: Slim Glitter II Flip Flop Sandal
Color: Ballet Rose/Golden Blush
Price: $38.00
Rating: 4Rated 4 stars out of 5(13)

Stuart Weitzman - Nudistcurve 85 Wedge. Color Poudre. On sale for $297.00. MSRP $495.00.. 4.6 out of 5 stars

Pink Stuart Weitzman Nudistcurve 85 Wedge

+2 colors/patterns

Brand Name: Stuart Weitzman
Product Name: Nudistcurve 85 Wedge
Color: Poudre
Price: $297.00MSRP: $495.00
Rating: 5Rated 5 stars out of 5(10)

Yellow Box - Feliks. Color Black. On sale for $24.50. MSRP $35.00.. 4.4 out of 5 stars

Brand Name: Yellow Box
Product Name: Feliks
Color: Black
Price: $24.50MSRP: $35.00
Rating: 4Rated 4 stars out of 5(29)

Touch Ups - Amara. Color Silver. Low Stock. $70.95. 4.1 out of 5 stars

9 left in stock

Brand Name: Touch Ups
Product Name: Amara
Color: Silver
Price: $70.95
Rating: 4Rated 4 stars out of 5(32)

Havaianas - Slim Glitter Iridescent Sandals. Color Peach Rose. $34.00.

Pink Havaianas Slim Glitter Iridescent Sandals

+2 colors/patterns

Brand Name: Havaianas
Product Name: Slim Glitter Iridescent Sandals
Color: Peach Rose
Price: $34.00
Rating

Havaianas - Slim Gloss Flip Flop Sandal. Color Navy/Navy. $34.00. 3.0 out of 5 stars

Blue Havaianas Slim Gloss Flip Flop Sandal

Brand Name: Havaianas
Product Name: Slim Gloss Flip Flop Sandal
Color: Navy/Navy
Price: $34.00
Rating: 3Rated 3 stars out of 5(4)

Jessica Simpson - Rayli2. Color Gold. $78.95. 4.2 out of 5 stars

Brand Name: Jessica Simpson
Product Name: Rayli2
Color: Gold
Price: $78.95
Rating: 4Rated 4 stars out of 5(9)

Johnston & Murphy - Grace Cross Band Slide. Color Bone. On sale for $115.88. MSRP $138.00..

Bone Johnston & Murphy Grace Cross Band Slide

Brand Name: Johnston & Murphy
Product Name: Grace Cross Band Slide
Color: Bone
Price: $115.88MSRP: $138.00
Rating

Touch Ups - Ava. Color Champagne. Low Stock. $84.95. 4.0 out of 5 stars

7 left in stock

Brand Name: Touch Ups
Product Name: Ava
Color: Champagne
Price: $84.95
Rating: 4Rated 4 stars out of 5(5)

Touch Ups - Jordy. Color Champagne. Low Stock. On sale for $55.34. MSRP $70.95..

6 left in stock

Brand Name: Touch Ups
Product Name: Jordy
Color: Champagne
Price: $55.34MSRP: $70.95
Rating

Havaianas - Slim Carnaval Flip Flop Sandal. Color Black. $38.00. 3.9 out of 5 stars

Black Havaianas Slim Carnaval Flip Flop Sandal

Brand Name: Havaianas
Product Name: Slim Carnaval Flip Flop Sandal
Color: Black
Price: $38.00
Rating: 4Rated 4 stars out of 5(18)

Paradox London - Helice. Color Silver. On sale for $58.06. MSRP $69.95.. 3.7 out of 5 stars

+2 colors/patterns

Brand Name: Paradox London
Product Name: Helice
Color: Silver
Price: $58.06MSRP: $69.95
Rating: 4Rated 4 stars out of 5(3)

Easy Street - Flattery. Color Navy Glitter. Low Stock. On sale for $50.07. MSRP $64.99.. 3.7 out of 5 stars

8 left in stock

Brand Name: Easy Street
Product Name: Flattery
Color: Navy Glitter
Price: $50.07MSRP: $64.99
Rating: 4Rated 4 stars out of 5(6)

Touch Ups - Libra. Color Silver. $89.95. 3.0 out of 5 stars

Brand Name: Touch Ups
Product Name: Libra
Color: Silver
Price: $89.95
Rating: 3Rated 3 stars out of 5(2)

VOLATILE - Festina. Color Blush. $54.99. 2.5 out of 5 stars

Brand Name: VOLATILE
Product Name: Festina
Color: Blush
Price: $54.99
Rating: 3Rated 3 stars out of 5(2)

Havaianas - Slim Square Glitter Party. Color Golden. $42.00.

Brand Name: Havaianas
Product Name: Slim Square Glitter Party
Color: Golden
Price: $42.00
Rating

Tory Burch - Mini Miller Jelly Thong Sandal. Color Silver/Gold. Low Stock. $98.00. 3.7 out of 5 stars

3 left in stock

Gold Tory Burch Mini Miller Jelly Thong Sandal

Brand Name: Tory Burch
Product Name: Mini Miller Jelly Thong Sandal
Color: Silver/Gold
Price: $98.00
Rating: 4Rated 4 stars out of 5(252)

SAS - Freedom. Color Sunstone. $118.95. 3.1 out of 5 stars

Brand Name: SAS
Product Name: Freedom
Color: Sunstone
Price: $118.95
Rating: 3Rated 3 stars out of 5(28)

Stuart Weitzman - Goldie 60 Block Slide. Color Poudre. Low Stock. On sale for $220.50. MSRP $525.00.. 4.5 out of 5 stars

3 left in stock

Pink Stuart Weitzman Goldie 60 Block Slide

Brand Name: Stuart Weitzman
Product Name: Goldie 60 Block Slide
Color: Poudre
Price: $220.50MSRP: $525.00
Rating: 5Rated 5 stars out of 5(4)

J. Renee - Jivika. Color Pewter. On sale for $72.37. MSRP $109.95.. 3.2 out of 5 stars

Brand Name: J. Renee
Product Name: Jivika
Color: Pewter
Price: $72.37MSRP: $109.95
Rating: 3Rated 3 stars out of 5(9)

Havaianas - Slim Animals Glitter Flip Flop Sandal. Color Steel Grey. Low Stock. On sale for $21.42. MSRP $34.00.. 3.0 out of 5 stars

7 left in stock

Gray Havaianas Slim Animals Glitter Flip Flop Sandal

Brand Name: Havaianas
Product Name: Slim Animals Glitter Flip Flop Sandal
Color: Steel Grey
Price: $21.42MSRP: $34.00
Rating: 3Rated 3 stars out of 5(1)

Touch Ups - Beatrix. Color Silver. Low Stock. $83.95. 3.9 out of 5 stars

1 left in stock

Brand Name: Touch Ups
Product Name: Beatrix
Color: Silver
Price: $83.95
Rating: 4Rated 4 stars out of 5(8)

Stuart Weitzman - Nudistcurve 100 Sandal. Color Platino. Low Stock. On sale for $356.25. MSRP $475.00.. 4.6 out of 5 stars

1 left in stock

Gold Stuart Weitzman Nudistcurve 100 Sandal

Brand Name: Stuart Weitzman
Product Name: Nudistcurve 100 Sandal
Color: Platino
Price: $356.25MSRP: $475.00
Rating: 5Rated 5 stars out of 5(127)

Jewel Badgley Mischka - Catalina. Color Silver. Low Stock. On sale for $64.20. MSRP $109.00.. 4.0 out of 5 stars

6 left in stock

Brand Name: Jewel Badgley Mischka
Product Name: Catalina
Color: Silver
Price: $64.20MSRP: $109.00
Rating: 4Rated 4 stars out of 5(20)

Jewel Badgley Mischka - Reese. Color Silver. On sale for $56.60. MSRP $99.00.. 2.7 out of 5 stars

Brand Name: Jewel Badgley Mischka
Product Name: Reese
Color: Silver
Price: $56.60MSRP: $99.00
Rating: 3Rated 3 stars out of 5(3)

Jewel Badgley Mischka - Rosa. Color Silver. Low Stock. On sale for $118.63. MSRP $129.00.. 2.7 out of 5 stars

7 left in stock

Brand Name: Jewel Badgley Mischka
Product Name: Rosa
Color: Silver
Price: $118.63MSRP: $129.00
Rating: 3Rated 3 stars out of 5(3)

Jewel Badgley Mischka - Lori. Color Light Gold. Low Stock. On sale for $75.68. MSRP $109.00.. 2.5 out of 5 stars

5 left in stock

Brand Name: Jewel Badgley Mischka
Product Name: Lori
Color: Light Gold
Price: $75.68MSRP: $109.00
Rating: 3Rated 3 stars out of 5(6)

Jewel Badgley Mischka - Georgia. Color Silver. Low Stock. On sale for $110.39. MSRP $119.00.. 2.0 out of 5 stars

1 left in stock

Brand Name: Jewel Badgley Mischka
Product Name: Georgia
Color: Silver
Price: $110.39MSRP: $119.00
Rating: 2Rated 2 stars out of 5(1)

Jessica Simpson - Stassey. Color Champagne. Low Stock. On sale for $53.56. MSRP $69.00.. 3.7 out of 5 stars

2 left in stock

Brand Name: Jessica Simpson
Product Name: Stassey
Color: Champagne
Price: $53.56MSRP: $69.00
Rating: 4Rated 4 stars out of 5(15)

Naturalizer - Thena 2. Color Taupe Suede. Low Stock. On sale for $105.14. MSRP $125.00.. 4.6 out of 5 stars

8 left in stock

Brand Name: Naturalizer
Product Name: Thena 2
Color: Taupe Suede
Price: $105.14MSRP: $125.00
Rating: 5Rated 5 stars out of 5(10)

Jewel Badgley Mischka - Ridley. Color Silver. On sale for $76.45. MSRP $139.00..

Brand Name: Jewel Badgley Mischka
Product Name: Ridley
Color: Silver
Price: $76.45MSRP: $139.00
Rating

Jewel Badgley Mischka - Gallant. Color Silver. Low Stock. On sale for $51.58. MSRP $129.00.. 4.6 out of 5 stars

3 left in stock

Brand Name: Jewel Badgley Mischka
Product Name: Gallant
Color: Silver
Price: $51.58MSRP: $129.00
Rating: 5Rated 5 stars out of 5(5)

Jewel Badgley Mischka - Odessa. Color Silver. Low Stock. On sale for $70.87. MSRP $119.00.. 3.0 out of 5 stars

2 left in stock

Brand Name: Jewel Badgley Mischka
Product Name: Odessa
Color: Silver
Price: $70.87MSRP: $119.00
Rating: 3Rated 3 stars out of 5(7)

Bandolino - Armory. Color Silver Glamour Nu Glamour Material. On sale for $41.60. MSRP $59.00.. 4.1 out of 5 stars

Brand Name: Bandolino
Product Name: Armory
Color: Silver Glamour Nu Glamour Material
Price: $41.60MSRP: $59.00
Rating: 4Rated 4 stars out of 5(199)

Nina - Bibiana. Color Silver. Low Stock. On sale for $52.48. MSRP $89.00..

1 left in stock

Brand Name: Nina
Product Name: Bibiana
Color: Silver
Price: $52.48MSRP: $89.00
Rating

CL By Laundry - Jody. Color Silver Shimmer. On sale for $29.97. MSRP $49.99.. 3.5 out of 5 stars

Brand Name: CL By Laundry
Product Name: Jody
Color: Silver Shimmer
Price: $29.97MSRP: $49.99
Rating: 4Rated 4 stars out of 5(68)

SAS - Float. Color Sunstone. Low Stock. $118.95. 3.1 out of 5 stars

8 left in stock

Brand Name: SAS
Product Name: Float
Color: Sunstone
Price: $118.95
Rating: 3Rated 3 stars out of 5(7)

Aerosoles - Nadia. Color Gold Metallic. Low Stock. On sale for $136.92. MSRP $145.00..

1 left in stock

Brand Name: Aerosoles
Product Name: Nadia
Color: Gold Metallic
Price: $136.92MSRP: $145.00
Rating

Jessica Simpson - Jaisey 2. Color Clear/Silver. Low Stock. On sale for $76.14. MSRP $99.00.. 3.5 out of 5 stars

7 left in stock

Brand Name: Jessica Simpson
Product Name: Jaisey 2
Color: Clear/Silver
Price: $76.14MSRP: $99.00
Rating: 4Rated 4 stars out of 5(4)

Franco Sarto - Harley. Color Black Shiny Fabric. Low Stock. On sale for $108.27. MSRP $140.00..

6 left in stock

Brand Name: Franco Sarto
Product Name: Harley
Color: Black Shiny Fabric
Price: $108.27MSRP: $140.00
Rating

Seychelles - Sweetener. Color Shimmer Fabric. Low Stock. On sale for $101.15. MSRP $119.00.. 4.5 out of 5 stars

3 left in stock

Brand Name: Seychelles
Product Name: Sweetener
Color: Shimmer Fabric
Price: $101.15MSRP: $119.00
Rating: 5Rated 5 stars out of 5(2)

Paradox London - Hibiscus. Color Silver. Low Stock. On sale for $44.27. MSRP $69.95.. 2.9 out of 5 stars

3 left in stock

Brand Name: Paradox London
Product Name: Hibiscus
Color: Silver
Price: $44.27MSRP: $69.95
Rating: 3Rated 3 stars out of 5(10)

Paradox London - Kitty. Color Champagne. Low Stock. $68.95. 4.8 out of 5 stars

3 left in stock

Brand Name: Paradox London
Product Name: Kitty
Color: Champagne
Price: $68.95
Rating: 5Rated 5 stars out of 5(4)

Nina - Samara. Color Dark Silver. On sale for $58.31. MSRP $119.00.. 1.0 out of 5 stars

Brand Name: Nina
Product Name: Samara
Color: Dark Silver
Price: $58.31MSRP: $119.00
Rating: 1Rated 1 star out of 5(1)

Paradox London - Helka. Color Silver. Low Stock. $82.95. 2.0 out of 5 stars

1 left in stock

Brand Name: Paradox London
Product Name: Helka
Color: Silver
Price: $82.95
Rating: 2Rated 2 stars out of 5(1)

Anne Klein - Genie. Color Silver. Low Stock. On sale for $78.15. MSRP $85.00.. 2.0 out of 5 stars

3 left in stock

Brand Name: Anne Klein
Product Name: Genie
Color: Silver
Price: $78.15MSRP: $85.00
Rating: 2Rated 2 stars out of 5(1)

Women's Glitter Sandals

Your Selections

Search Results

Get on the List

About Zappos

Customer Service

Resources

Explore Zappos