Salomon Skin pro 10+3 Hydration System. Form fitting running pack with stretch comfort, one-size fits all versatility and expandable volume. Letting yourself get dehydrated is the quickest way to compromise your performance and ruin your fun. A hydration system lets you carry a good amount (usually 2 or 3 litres) of water without interfering with your hands and with a convenient valve to drink from whenever you like. During intensive exercise, you'll need to drink around 1 litre of water every hour which means sipping little and often - much easier if you don't have to stop what you're doing and locate a bottle. So buy this and you can Save £34.50 Off Salomon Skin pro 10+3 Hydration System Now £80.50.