Poly/cotton: A Blend Of Polyester And Cotton That Offers Comfort And Durability Elastane: Synthetic Fiber With Exceptional Comfort And Elasticity Male: Tailored Specifically For Men With Options For Looser And Wider Fits Medium: This Apparel Offers Details That Are A Step Above Our Basic Collection Zipper: Opens And Closes Using A Slide Along Two Flexible Strips Of Metal Long: Sleeves Extend Down The Full Length Of Arm And Stop At The Wrists Double Needle: Stitching Method With Two Lines Sewn Side By Side For Strength Top: Sewing Technique Where Stitch Line Can Be Seen On Outside Of Garment