Cause: Suction, which helps keep out water, can also cause goggle frames to sink deep into the delicate tissue under the eyes, accentuating puffiness and dark circles, says Monica Scheel, MD, a board-certified dermatologist in Kona, Hawaii (home of the Ironman Triathlon World Championships).
Solution: While there's no such thing as a crease-free pair of goggles (especially if you have noticeably deep tear troughs), your best bet is to find a pair that doesn't sit directly under the eyes, says Scheel, who not only treats triathletes but is also an Ironwoman champion. Either go small, with the race series by View or the Speedo Jr. Hydrospex goggles (kids' frames tend to cover less of the eye area), or find a wider mask that hits lower on the face. The swimwear company Aqua Sphere is owned by the diving outfitter Aqua Lung, and the scuba influence can be seen in the broader design of its Kayenne goggles and, especially, in the Vista Lady swim mask, which has a soft silicone facial "skirt" that doesn't dig into the skin. The company says Olympic swimmer Amanda Beard trains and races in the Kayenne and wears the Vista during open-water fun swims.