The FS4 Orthotic Sock incorporates the award winning and patented FS6 Compression Foot Sleeve technology. Wearing the FS4 socks while active will aid in preventing Plantar Fasciitis symptom onset and act as an overall foot health aid. With precise targeted compression levels, the FS4 is designed for proper foot support and injury prevention. The seamless construction with light padding in just the right places creates surprisingly comfortable support. The soft, moisture-wicking fabric with anti-odor treatment creates a healthier environment for your feet. FS4 represents the first sock product with true orthotic benefits that strengthen the foot structure, help prevent Plantar Fasciitis, arch strain, swelling, and other conditions. OrthoSleeve Compression Zone Technology® defines a new way of making ortho supports. This breakthrough technology delivers medical grade support in thinner, more comfortable, discreet medical devices. No longer is it necessary to use heavy splints, uncomfortable neoprene fabrics and frustrating Velcro. OrthoSleeve products allow you to receive the support and pain relief you deserve any time of day. These products go where you go. We call this motion comfortTM.