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Aqua V Swim Cap

Speedo and Getty Images

Aqua V Swim Cap

Who made it? Speedo
Who's using it at the Olympics? Michael Phelps (U.S.)
When can I get it? Now
How much will it cost? $19.99

The Aqua V silicone swim cap is designed to reduce a swimmer's drag in the water by 5%. The cap sits low on the ears and fits around the base of the neck for a streamlined shape. It is made from a material that's much firmer than in traditional silicone caps, which prevents the force of the water from creating wrinkles. That, in turn, can also reduce drag—and provide a real advantage in a race where milliseconds count.