Fox racing flexair pro fire alpha mtb jacketlocking in warmth but ensuring you don't overheat, the fox racing flexair pro fire alpha mtb jacket uses polartecreg alphareg active insulation to regulate body temperature when you're mountain biking'. '.strtoupper('n')o more need to pull on and off layers in reaction to changeable weather'. '.strtoupper('n')ot only does the terrain always change when you're mountain biking but the weather can too'. '.strtoupper('p')articularly as you climb and descend hills and mountains'. '.strtoupper('i')t's here that the flexair pro fire alpha mtb jacket really proves its worth'. '.strtoupper('a')t its core is polartecreg alphareg insulation'. '.strtoupper('w')hile incredibly light, it's also remarkably good at holding on to the heat you generate when riding'. '.strtoupper('h')owever, when you're taking on a particularly tough climb or temperatures warm up a touch, it allows sweat vapour and easy escape, preventing you from becoming drenched in sweat on the uphill and shivering on the downhill'. '.strtoupper('c')hest and back vents also allow for airflow to the body, ensuring freshness as you ride'. '.strtoupper('s')hould wetter conditions arrive you'll also be protected via a waterproof outer layer'. '.strtoupper('a') dwr durable water repellent finish also sheds the inevitable dirt and debris kicked up from wet trails'. '.strtoupper('w')hatever mountain bike trails throw your way, the flexair pro fire alpha mtb jacket has you covered'. '.strtoupper('f')eaturesmaterials 50% polyester, 38% polyamide, 12% elastanepolartecreg alphareg insulationintake vents on the chest and exhaust vent on the backdwr finish sheds water, dirt, and debrisergonomically located, zippered hand pockets with elastic interior pocketzippered hatch for easy access to pockets on mid layerselastic cuffs for added comfort10,000mm waterproof rating 30,000gm breathability ratingbuy fox racing clothing from chain reaction cycles, the world's largest online bike store.