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Gen III Silk Weight Bottoms features 4 Oz 100% Polyester Jersey Knit Fabric , Level-1 Of The E.C.W.C.S. System , Highly Breathable , Moisture Wicking , Anti-Microbial , Anti-Odor Defense , Undershirt Features: Long Back Tail, Thumbhole Sleeves , Bottoms Feature: Elastic Waistband, Access Fly