Step-on sliders do not attach to the shoe and can be used on either foot. The step-on slider comes in a 1/16" Teflon option only. This slider is good for beginner or novice curlers. Basic Size chart: XS-Women's sizes 5-7.5 SM-Women's sizes 8-10 MED-Women's sizes 10.5-11 & Men's sizes 7-9 LARGE-Men's sizes 9.5-11 XL-Men's sizes 11.5-14