MIDWEIGHT BASE LAYER FOR YOUTH - These kids' thermal base layer pants have a single jersey knit with slight brushing for a soft, lived-in feel. The MTF polyester fibers of our Pepper Skins bottoms work to transport moisture away from the skin to keep you warm and dry MOISTURE TRANSFER FIBERS - These thermal base layer pants for kids are manufactured with MTF polyester fibers, which work to transport moisture away from the skin by employing hydrophobic yarns to wick away perspiration, thereby keeping you dry and comfortable LIGHTWEIGHT BREATHABLE THERMAL BOTTOM - The breathable material and lightweight design ensures that you stay cool while still enjoying superior insulation even in cold weather; it's the perfect choice for outdoor adventurers and everyday wearers alike WARMTH FACTOR 6/10 - Ranked from Mild to Hot, the Warmth Factor Thermometer tells you how warm each of our products is; warmth Factors 6, 7, and 8 are considered Midweight and are very popular for most cold-weather activities; spun polyester is slightly brushed for extra softness VERSATILE FOR SPORTS OR EVERYDAY ACTIVITIES - The construction of these pants is designed for optimum breathability and comfort, creating the perfect base layer for outdoor activities; they feature plush-back elastic waistband, gusset that eases movement and reduces seam bulk, flat seam construction for seam strength and longevity HOT CHILLYS YOUTH SKINS BOTTOM, Color: Black, Size: XXS (PS3500-101-XXS)