4-way stretch polyester wicks, breathes and offers UPF 50 sun protection Drop-in hand pockets with hidden, zippered security pocket inside right pocket Drawstring waistband for a comfortable fine-tuned fit Made using bluesign®-approved materials, which conserve resources and protect the health of the environment, workers and wearer (you!) REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits Contains materials that meet the bluesign® criteria