Z-CoiL Footwear generally runs true to size. Order the size that you most normally wear. If you wear a half size, please order the next size up unless it is one of the ones that runs in a E width (see "width" below), and follow the directions for fitting a 1/2 size shoe below.
Width
All our shoes are built with a rounded heel and raised arch for a great ergonomic fit. We strive to support each contour on your feet. The toe box on a pair of Z-CoiLs is wider than normal shoes and designed to prevent irritation in the toes and ball of the foot. Its important that you wear shoes that prevent cramping or squeezing of the toes. Tension on the toes can easily lead to bunions and disfigurement of the toes and ball of the feet. Its important to set your toes free and allow them to spread out naturally with each step.
1/2 Sizes
Z-CoiL does not make half sizes. Instead all Z-CoiL Footwear ship with an extra 3 mm insert that makes up 1/2 size. If you are between sizes, add the insert as follows:
1. Remove the Z-CoiL insole from the inside of the shoe.
2. Insert the 1/2 Size Insert
3. Re-insert the Insole
Spring Strength
Z-CoiL has 4 different sized springs. The size of the shoe dictates what size of spring is loaded at the factory. In some cases, customers will choose a softer or stiffer spring based on their weight or gait type. Your objective should be to compress the spring about 75% during a normal walk (or a normal run -- if you run in Z-CoiL's). If you "bottom out" on the spring, you may want to consider a stronger spring. If you feel your shoe is too stiff, you may consider a softer coil. The vast majority of consumers do not change the factory spring strength.
- Women's sizes 5~7 are factory loaded with a small spring.
- Women's sizes 8~11 & Men's 8~9 are factory loaded with a medium spring.
- Men's 10~13 are factory loaded with a large spring.
- Men's 14+ are loaded with an XL spring.
| CoiL Diameter | Coil Size | Typical weight | |
| 6.2 mm | Small | up to 150 lbs. | |
| 6.5 mm | Medium | 120 - 200 lbs. | |
| 7.2 mm | Large | 160 - 240 lbs. | |
| 7.5 mm | X-Large | 220 lbs. + |
Factory Spring and Shoe Lace Sizes
