Smartwool Classic Thermal Merino Base Layer Crew – Kids' race-day A wide waistband and articulated

A wide waistband and articulated cut mean it stays put

Durable polyester construction built to handle daily wear whether it's the classroom

Cyclone construction wraps recycled synthetic insulation in vertical baffles for efficient heat retention

Its breathable groove design prevents heat and moisture buildup during workouts

stretchy fabric moves with every stride while an inner brief provides secure coverage

Smartwool Classic Thermal Merino Base Layer Crew – Kids' race-day A wide waistband and articulatedBuilt for active kids who won't slow down when the temperature drops, the Classic Thermal Merino Base Layer Crew is our top pick for cold weather layering. Merino wool naturally regulates body temperature and resists odor, so they stay comfortable from first chair to last run. Flatlock seams cut down on chafing during all day movement. Merino wool construction provides natural warmth without bulk regulates temperature as activity levels change