Alpinestars Toe Sliders. Compatible with the following models: Supertech R, S-MX Plus until 2010, S-MX R, S-MX R GORE-TEX, S-MX 5, S-MX 5 LADY, S-MX 5 WATERPROOF, S-MX 4, S-MX 4 LADY, S-MX 4 WATERPROOF, S-MX 2, S-MX 2 WATERPROOF, S-MX 1.