The HOT CHILLYS(R) Youth Bi-Ply mid-weight bottoms are your last line of defense against the cold. They feature a special layered construction to trap warm air while repelling the cold. Chilly s Seasonings technology wicks away moisture while retaining body heat, and flat seams reduce overall bulk and abrasion. Features: Flat seam construction to reduce bulk and skin abrasion Gusset eases movement and reduces seam bulk Plush back waistband