A hybrid one-piece swimsuit (with boyleg/short or classic bottoms) with rash guard material and design. There are designs for males and females and this variation is much catered to children. Swim shirts Swim shirts are relatively new to the consumer market, but are growing in popularity. They are generally more loose fitting and casually worn. Their primary purpose is to offer an alternative to sunscreen to protect the wearer's skin from the sun's UV radiation and possible skin cancer. Many swim shirts carry a UPF rating of 50+, which blocks out over 98% of the sun's harmful rays. Many people find that sunscreen isn't always enough because it is often not used properly and some have skin allergies or sensitivities to chemicals in sunscreens. Children's skin can be especially sensitive to the sun and sunscreens. Many children, and parents, find it is much easier to put on a swim shirt as it is loose and easily slipped on. There are also zip front rash guards available which makes slipping in and out of them even easier, especially when wet. Furthermore, it is comfortable and yet gives sun protection. Even though the name generally applies to water sports, people use swim shirts for an array of activities: swimming, boating, golfing, tennis, gardening, playing in the sprinklers, water parks, beach trips, pool play, rivers and lakes, water skiing, surfing, snow skiing, sledding, skimboarding, in mixed martial arts and Brazilian jiu-jitsu, and even as normal everyday clothing. Rash guards for grappling / mixed martial arts Many practitioners wear rash guards underneath a gi or as a stand-alone garment for training in various grappling sports and mixed martial arts (MMA). The potential, but not proven, benefits for this include: Protect skin against mat burn. Moisture control. Compression effect on the muscles which is beneficial when it comes to preventing muscle sprain/strain. Good hygiene practice. In most cases, Brazilian jiu-jitsu (BJJ) and MMA rash guards are thinner than traditional rash guards meant for surfing or diving. They also don’t offer UV protection. Over the years MMA rash guards evolved and most have the following distinct features: enforced stitching; a gel panel on the bottom of the rash guard to keep it from rolling up while sparring; fewer stitches, and a mix of 80% polyester and 20% spandex. They also carry unique designs, usually martial arts-centered but not strictly. In competition, BJJ athletes are allowed to