The North Face - Borealis Sling. Color Peak Purple/TNF Black. On sale for $51.87. MSRP $59.00.. 4.5 out of 5 stars+11Brand NameThe North FaceProduct NameBorealis SlingColorPeak Purple/TNF BlackPrice$51.87MSRP: $59.00Rating5Rated 5 stars out of 5(460)