Under Armour Boys' UA Base™ 2.0 Crew Long Sleeve - Black Size (Kids - Unisex Clothing):XL Their crew-height design and secure

Their crew-height design and secure fit pair comfortably with hiking boots or trail shoes for all-season outdoor wear

• Microfiber collapsible heel

stretchy UA IntelliKnit upper for a super-breathable sock-like fit & feel

making them a winter essential for active kids

Lightweight construction for easy movement

Under Armour Boys' UA Base™ 2.0 Crew Long Sleeve - Black Size (Kids - Unisex Clothing):XL Their crew-height design and secureUA Base 2. 0 is built for cold weather and high activity levels. It uses a unique pattern that's designed to trap heat without adding bulk. Think long underwear, revamped for today's top athletes. UA Base 2. 0 Active Baselayer is lightweight, flexible & breathable for high activity performance in cool conditions Soft, brushed grid interior traps air against your skin, closely managing your body's microclimate to keep you warm & comfortable Material