There's no such thing as triathlon-specific swim goggles, but the right combination of features makes a pair suitable for this kind of event. The type of lens you should choose depends on whether you'll be racing in open water or an indoor pool. Goggles for open-water swimming should provide excellent visibility and sun protection while minimizing glare. For indoor swimming, a clear lens might be better for visibility.In all racing situations, a secure fit is critical. It's especially important in cases where flip turns are necessary. Any competition swim goggles will do for a triathlon. Just pick the right lens tint, and make sure you have a good seal to prevent water from seeping in.