Superfeet Blue Insole Size:D 1/4" black elastic cord with

1/4" black elastic cord with white knob

Pressure gauge measures ball pressure 0-30 psi

Material: High Tenacity Polypropylene (HTTP)

Depth: 0' | Base: 8 1/4'

Fits Best In: All types of medium and high-volume women's footwear with removable insoles like athletic shoes and boots

Superfeet Blue Insole Size:D 1/4" black elastic cord withAll Purpose Performance Long lasting support packed into a thinner, high performance insole to help improve the fit of a wide range of footwear. Fit Profile: Medium profile insole with the shape that can fit into most footwear, while providing a medium level of support. Fits Best In: Most types of low and medium volume footwear, even some without removable insoles. Size B: 2. 5 4 (Junior's), 4. 5 6 (Women's) Size C: 5. 5 7 (Men's), 6. 5 8 (Women's)