These spikes are men's sizes. Go up 1.5 sizes for women. Tackle the toughest course with the track inspired design of the XC5K v5 cross country spike. This agile spike has been updated with new burrito construction and single layer mesh upper to provide an incredibly lightweight but aggressive fit. This version also features a new knit collar construction for a sock like feel. It's built on the same bottom unit: a REVlite midsole with an aggressive 5-spike configuration.