Please Note: If you are going to wear your NEOS over a work or combat boot, you NEED to go a size up from our chart

Men & Women's Shoe Size
SMALL M - 5-6.5 / W - 6-8 11"x 4.3"
MEDIUM M - 7-8.5 / W - 8.5-10 11.8"x 4.4"
LARGE M - 9-10.5 / W - 10.5-12 12.4"x 4.5"
X-LARGE M - 11-12.5 12.8"x 4.6"
2X-LARGE M - 13-14.5 13.5"x 4.8"
3X-LARGE M - 15-16.5 14"x 5"
4X-LARGE M - 17+ 14.25" x 5"