Made in a 100% merino wool sweatshirt fleece, these pants are designed as a mid layer to replace your polyester fleece once and for all! They feature a looser fit through the thighs, gusset for maximum mobility, reinforced knees, POCKETS, and our signature "growth-spurt proof" design. Plus, they are machine washable and 4x more durable than tradition merino layers! Perfect for all your mid-season adventures and evening around the campfire.