The PhD Ultralight Sock from Smartwool features a unique blend of tech features and Merino wool to offer you a versatile outdoors sock. The 4 Degree Elite Fit System ensures your PhD Ultralight stays snug, while the Merino wool blended fiber helps to keep your heat in while wicking moisture away.
New 4 Degree Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place
Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable/li>
Low profile and durable virtually seamless toe/li>
Alternating 1x1 welt, Single layer 1x1 ribbed top/li>