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.