Best for: Soft, breathable and stretchy, this base layer is made for adventuring.. The features: Our Crew Neck Base Layer has you covered. With a crew neck and deep cuffs with thumb loops so you can keep warm on cooler days. With soft, stylish stitching.. Our fabric: Our classic jersey fabric is a supremely soft and smooth blend of bamboo viscose and organic cotton. We've added a little stretch for comfort and ease of movement... Easy care - machine wash at 30°. 68% Bamboo Viscose, 28% Organic Cotton, 4% Elastane