The SAYSKY Classic Merino Base 150 Longsleeve is a merino and tencel running t-shirt. The mix of tencel and merino gives the t-shirt a super soft and light feeling. Pair it with a running jacket and you're ready to take on the harshest of conditions. It comes in black with a SAYSKY logo on the front, and a woven SAYSKY label on the back and arm. The fit is very slim.