Ariat Ladies Sunstopper 1/4 Zip Baselayer Reykjavik Blue Ditsy Horse. The Ariat Ladies Sunstopper 1/4 Zip Baselayer is a fully versatile raglan-cut sleeve top giving you a flattering fit as well as breathable tech mesh panelling in all the places you need it most making it 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 especially when the competition heats up and a versatile 1/4 Zip collar and a stock tie loop.