Ariat Ladies Sunstopper 1/4 Zip Team Baselayer. The Ariat Ladies Sunstopper 1/4 Zip Team Baselayer is a fully versatile long sleeved top perfect for keeping you cool on warmer days or for layering all year round. The Sunstopper offers a lightweight pique knit material equipped with Sun Protection Fabric TM which protects your skin against harmful rays whilst the Moisture Movement Technology TM helps keep you dry and comfortable as it draws moisture away from the skin. The Sunstopper also features a mesh underarm to keep you cool on the warmest of days and a versatile 1/4 Zip collar and a stock tie loop.