Paradox Men's Performance Merino Blend Zip-Up Long Sleeve Base Layer Features 1/4" front zipper and zipper cover to hold zipper in place Structured material made with 84% Polyester, 11% Merino Wool and 5% Spandex Patented Dri-Release and Anit- Odor wicking material for high intensity workouts Stretch, lightweight top provides comfortable warmth without the itchiness Dries 4x faster than Cotton, perfect for all outdoor activities in the winter cold!