SW017353 Smartwool Men's Merino Sport Fleece Pant Smartwool's Men's Merino Sport Fleece Pants feature super-soft, unbelievably comfortable Merino next to skin, while a durable synthetic outer material helps provide additional weather protection in harsh conditions. Flatlock seam construction helps eliminate chafing, so no matter if you're out training on a cold winter day or lounging around after skinning, you can experience extreme comfort and adventure-ready performance.