Mens Greatness Half Zip Mock Neck is 170 gsm, 50% cotton, 45% poly, and 5% spandex. This unique composition of cotton, polyester, and spandex offers an optimal combination of softness, stretch, and comfort in this modern heather half-zip long sleeve. Bonded half-zip with mock neck for enhanced wind resistance. Half-zip collar with a sealed cuff to avoid zipper touching skin. Raglan sleeves and Spandex for better movement and a comfortable stretch fit.