Boys Rashies are important for protecting the grombats from sun, sand wind and whatever obscure substances they may manage to find, namely when they're wet or in the ocean. Most kids rashies are made of a lycra/spandex like material that is highly stretchy, allowing a tight and hydrodynamic fit. We carry Boys Rash Guardsfrom leading brands such as Rip Curl, XCEL,
We've seen many microfibre/polyfleece/2P style rashies which are moderate insulators, nothing like neoprene but better than lycra - these make for ideal products in for pool swimmers in the winter, when the pool's heating isn't warm enough. Some customers will buy a poly-fleece rash vest to wear on the inside of their suit to provide extra warmth and insulation.
In recent years there has been a big push towards loose or relaxed fit rashies, which fit like a shirt but are made out of stretchy synthetics - you can tell the fit based upon the product image.