Open during the summer. Swimming is organised by Swim Your Swim (SYS). Hatfield has a short and long course – 200m and 800m respectively. Hartfield also has a Natural Lake Pool ( four-lane, 20-meter pool). They allow swimmers to swim in wetsuits and ‘skins’ (i.e. just your swimming costume) but you must be able to demonstrate your swim competence and experience. All swimmers will be asked to swim a test route before being allowed onto the longer course. All swimmers MUST wear a bright swim cap so our safety team can easily sport you – ORANGE, BRIGHT GREEN, or YELLOW. (White caps are not good as they often look like waves on the lake!)