Crew Neck Long Sleeve Tee 200 g/m2 Crewneck Shirt 200 Long-sleeved crewneck shirt made of circular knit fabric, and has no lengthwise seams. The back is longer to prevent gaps. Cuffs are knitted in. 60% Merino Wool 25% Polyester 13% Polyamide 2% Elastane Weight M: 205g 200 g/m2 undergarments are designed to be worn directly against the skin as a moisture wicking base layer. The thinnest undergarment are ideal at temperatures ranging from -4 F to 50 F degrees depending on the activity level.