. Arc'teryx - Wool Calidum 5 Panel Hat. Color Warm Stone. On sale for $27.50. MSRP $55.00.. 5.0 out of 5 starsBest Seller+2 colors/patternsBrand NameArc'teryxProduct NameWool Calidum 5 Panel HatColorWarm StonePrice$27.50MSRP: $55.00Rating5Rated 5 stars out of 5(3)