Occasional triathletes on a budget are best advised to hire a wetsuit but for the seasoned amateur or hardened pro, it's worth investing in something decent. "For a wetsuit with great pedigree, look no further than Sailfish," Alison says. "Designed and worn by Jan Sibbersen, who holds the swim record in the Hawaii Ironman, it perfectly combines buoyancy and flexibility. It's available in five women's and eight men's sizes."
How much £239