Lululemon Keep the Heat 1/2 Zip Size 4 Color Dark Olive Great preowned condition This high-performance base layer was made to keep you warm during intense cold-weather activities. Work up a sweat—the wool-blend fabric is wicking on the inside and insulating on the outside, so you feel warm and comfortable even when wet. wool-blend Wool-blend fabric dries quickly and helps regulate temperature. Dries quickly features Designed for: Run Slim fit: Fits close to the body