One piece aluminum alloy construction comes with flip-open lens caps and 1 inch picatinny rings

CSA/ASTM/CE approved

Composite Toe protects the toe from impact or compression

Night-time reflective strip on knuckle bar

Ultra-soft brushed Tricot lining

Great Canadian 40 Below Arctic Trail Sock- Over Size Color:Black One piece aluminum alloy constructionThe J. B. Field's 40 Below Arctic Trail is one of the warmest thermal socks they make, containing 85% preshrunk wool! This style was designed for people who require a sock to keep their feet dry and warm in the most extreme conditionsas low as 40C! Pair these winter socks with a liner sock to help wick away moisture and keep your feet feeling fresher, warmer, and blister free. (These socks run large. It's recommend wearing a liner or sizing down, if