The boys from Milcomp visited us in order to test the APC556 PDW. Here is their review:
5.11 Tactical Series socks 6" basic black (3 pack)
3 Pack Socks: Our best value with an engineered fit.
Follow the instructions of the manufacturer
75% Cotton / 15% Polyester / 4% Elastane / 4% Rubber / 2% Nylon
All prices shown incl. taxes.