Compessport Unisex's R2 Oxygen - UTMB 2022 - BlueUTMB 2022 Collection: elite level calf sleeve for maximum ventilation and muscle support to improve performance in your toughest races Many of our pro trailers opt for compression sleeves during ultra trails, as it means they can quickly change socks at the checkpoints without losing time or energy. So if you're heading to Chamonix this August, the licenced UTMB edition of our R2 Oxygen calf sleeves might be exactly what you're looking for. These top