Riding all year on the mountain bike needs a highly durable and capable jacket to cope with all the mud, muck and rain you'll encounter. Enter the Altura Mayhem 2 Waterproof Jacket with it's 20k/20k waterproof and breathability ratings and a rugged finish to keep you nicely comfortable for a day on the trails. We certainly build up a good sweat MTBing even on cooler days, and particularly when heading uphill. Which is why Altura engineer in strategically located venting zones that allow all that sweaty air to escape and keep a good airflow through the jacket. Read more… This helps maintains a far more stable core temperature, helping prevent wind chill and thus maintaining greater comfort. For the more committed of you mountain bikers out there, this jacket gives excellent wet weather protection so you can keep hitting your favourite trails all year round; even on a cold, wet and muddy winters day!