Z-CoiL Pain Relief Footwear Women's Sofia Slip Resistant Black Leather Mary Jane Importado Half sizes not available, order next size up. Example W8.5 should order a W9.0. A special  size insert is provided for comfortable fit. Easy slip-on style with adjustable velcro strap insures easy on/off and a great fit. A wide toe box relieves joint pain and pressure. Built-in rigid Z-Orthotic to protect and support plantar ligaments, reducing the pain of plantar faciitis, heel spurs, and arthritis. Patented conical heel spring - the Z-CoiL - to reduce up to 50% of impact as it eases overall fatigue and back pain. Forefront flex line and a rocker bottom sole to aid a fluid, natural walking motion. Rubber sole for additional slip resistance