The North Face - Borealis Sling. Color Solar Blue/TNF Black. On sale for $35.40. MSRP $59.00.. 4.5 out of 5 stars+4Brand NameThe North FaceProduct NameBorealis SlingColorSolar Blue/TNF BlackPrice$35.40MSRP: $59.00Rating4Rated 4 stars out of 5(369)