Mons Royale Enduro merino air-con mtb liner for long rides, enduro racing or multi-day adventures. Mons Royale Enduro merino air-con mtb liner for long rides, enduro racing or multi-day adventures. Climb, descend and do it again from dawn til dusk in naturally air-conditioned merino comfort. Enduro uses our Merino Air-Con 140. Nature's climate control - It keeps you cool when you're hot, warm when its not.