Slim Fit - Style: SW016060 Raglan sleeve design removes shoulder seams Flatlock seam construction designed to eliminate chafing Smartwool's lightest weight Merino jersey fabric uses a nylon core to increase durability while keeping Merino Wool next to skin Raglan sleeve design removes shoulder seams Flatlock seam construction designed to eliminate chafing Machine Wash COLD, Gentle Cycle Wash With Similar Color Do Not Bleach Tumble Dry LOW Cool Iron When Needed Or Dry Clean - For best appearance, wash garment inside out and flat/line dry. From taking the chill out of cool morning bike rides to hiking to the summit of Quandary Peak, you need a versatile layer that works as hard as you do. The year-round Merino 150 base layer short sleeve is up to the challenge thanks to the body temp regulating properties and breathability of Merino. Featuring Core Spun technology, Smartwool has wrapped Merino around a nylon core for added durability while still keeping the comfort of ultra-soft Merino next to skin. Smartwool added smooth flatlock seams to help minimize chafing and offset shoulder and side seams to lie smoothly beneath pack straps. Performs well on its own in warmer temps or layers up easily when cooler weather rolls in.