Hey Men When it's extremely cold and you are heading out for some high activity you will need these Dual Face Raschel Knit Fabric Of Fleece Inside And Waffle Weave Outside Long John Tops, They are full cut and shrinkage controlled for lasting fit and shape, The top has an extended tail to stay tucked in, Made with Hydro Pur Fiber that has Antimicrobial AlphaSan and Acts As Scent Blockers For Odor Control, Size Small = 34/36 Medium = 38/40 Large = 42/44 Extra Large = 46/48, 50% HydroPur Polyester 50% Cotton, machine wash and dry