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A compression style trunk gives you the tight fit you need to feel secure during workouts..... Compression style trunk underwear. Breathable athletic mesh back panel. 3" inseam. Temperature control. Tight fit (suggested sizing up for increased comfort). . The 2UNDR Power Shift Trunk is made of a super soft poly blend. Created with athletes in mind, this 3" trunk features a breathable athletic mesh back panel and temperature control to keep you cool and comfortable during any activity. For less compression, sizing up is suggested for optimal comfort...90% Polyester, 10% Elastane.