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Thermal bottoms with Stretchy Cotton Fleece Lined Fabric; Double Layer Pouch with Functional Fly; Additional Crotch Lined; Perfect undergarment to wear indoors and outdoor as base layer under your pants. Stretchy Cotton Fleece Lined Fabric Made from premium cotton fleece lined fabric, this ultra-soft microfiber comfort fits thermal bottom with fleece lined inside for added warmth and thermal insulation. Perfect undergarment for an extra layer of warmth under your pants. Heat-Retention Thermal pants with spandex added for extra stretch and shape retention. Close-fitting style does better in keeping you warm and blocking the cold outside air. Double Layer Pouch with Functional Fly Curved cut ergonomic pouch offers you the perfect amount of space to move freely; Functional fly for easy-going when nature calls Best Gift With delicate outer packing, the thermal bottoms for men is the warmest present for your beloved father or husband in the cold winter.