DESIRED FIT CAN DEPEND ON EXPERIENCE AND PERFORMANCE.
If you climb V4 or 5.12A and under: So iLL recommends those who use women sizing to order 1 1/2 sizes up from your sneaker size. Example: If you wear a women's size 9 sneaker, select size W10.5 / M9. If you wear men's, So iLL recommends you order three sizes up. Example: If you wear a men's size 9 sneaker, select size W12 / M10.5.
If you climb V5 or 5.12B and above: So iLL recommends those who use women sizing to order 1/2 size up. Example: If you wear a women's size 9 sneaker, select size W9.5 / M8. If you wear men's, So iLL recommends you to order two sizes up. Example: If you wear a men's size 9 sneaker, select size W11 / M9.5.