Cotton: Made From 100 Percent, All-natural Cotton Fibers For Maximum Comfort 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 Elastic: Expands Or Retracts To Create A Tailored And Comfortable Fit Double Needle: Stitching Method With Two Lines Sewn Side By Side For Strength Three+: This Apparel Offers The Highest Level Of Storage Options Available Reinforced: Smaller-length Stitching Makes The Seam Stronger At Stress Points