The Diamond in the Snow Cool Kella Vest wraps your core in warmth. You could wear this as an extra layer for skiing, but you'll want to be sure to wear it afterwards too. The bright colors and great fit give the Cool Kella Vest a style that can't be ignored. It's actually reversible, giving you two different options for color. A low-profile Thermolite insulation provides lots of warmth without puffing you up.