Microfiber polyester yarns make the fabric of these fleece base layer pants so soft to the touch providing billowy warmth without weight. Micro Fleece base layers are durable and breathable. These men's heavyweight thermal pants are an excellent choice for layering without bulk.Micro Fleece features: Billowy warmth without weight Covered elastic waistband for added comfort Acclimate Dry fibers for moisture management Microfiber polyester is exceptionally durable Flat seam construction for seam strength and longevity Heavyweight warmth, active fit Imported 92% Polyester / 8% Spandex; 220 gsm PM1403 FOUR WAY STRETCH ODOR BLOCKING ACCLIMATE+ DRY Polarmax Men's Stretch Fit Natural-Rise Micro Fleece Tights