Event 20 gram Latex rubber swimming cap. These caps are a cheap opion for ocean swim events, triathlons, swimming competitions and school events etc. These caps are available in plain or custom printed with club logo / name and we have a large colour range avaliable..Latex swim caps, which are typically made of latex rubber, provide athletes with a more generous fit. Therefore, they're great for virtually every head size and shape. While latex is not naturally as long-lasting as silicone, it is the most inexpensive option.