The Black Diamond S/S BD Block Tee is made from organic cotton with a small elastane content for slight stretch, making it very comfy for all-day wear whether you\'re out climbing or just lounging around. We wanted to find out if there was more to know about the tee, so we checked Black Diamond\'s website, where we found this sentence: \"The Black Diamond Block Tee has the pieces that make up the whole, and together they unlock the crux sequence\".... Nope, we don\'t get it either. Answers on a postcard please.Organic cotton jersey (160 gsm, 96% organic cotton, 4% elastane)Fit: Regular