Liner socks have long been the gold standard within the Russell Pro-Staff group. All swear by them to add a second layer of protection from blisters and a secondary moisture wicking component. Even though our top Merino wool/polypropylene blends do a great job at wicking moisture away from the foot, our 80% polypropylene, 16% nylon, 2% elastic and 2% lycra Safari Liner provides an added measure of wicking and foot protection. Our Pro-Staff has long recommended polypropylene liners combined with heavier wool blend socks as the ideal environment for your foot. The two-sock system allows the socks to do the heavy work of protecting your foot from stress...hot spots...and blisters because the socks slip against one another while wicking blister-causing moisture out and away from your foot. A good quality liner like our new Safari Liner is always a good item to have in your gear bag as you never know when you will encounter extremely tough conditions. Be safe...not sorry. Khaki color only with Russell Moccasin-branded toe. Anti-microbial treated and made in the USA from the finest materials available.