iM Sports MILER Arm Sleeves for Running Block 98% of harmful UV rays (UPF 50+ sun protection) and our Stay-Dry fabric blend will keep you comfortable no matter what the temperature is. Premium running compression sleeves are top notch ultra-snug, second skin fit. Every stitch is sewn with Made in USA quality. Our sleeves will fit just about everyone from youth to adults of all sizes. They're so comfortable you will forget you have them on. For the Best Fit - Measure Your Arm Measure around your upper arm (above bicep, near armpit). Select the sleeve size where your measurement is within the range. XX-Small = 8.75” to 9.75” (length = 16”) X-Small / Small = 9.75” to 11.75” (length = 17”) Medium / Large = 11.5” to 13.5” (length = 18”) X-Large / XX-Large = 13.5” to 15.75” (length = 20”) XXX-Large = 16” to 19” (length = 21”) How Do You Wash the MILER Sleeve? Taking care of your iM Sports Running Arm Sleeves couldn't be easier! Taking proper care of your sleeve will help maintain its appearance and its elasticity. Machine or hand wash cold Lay flat and air dry Do not put in dryer. iM Sports Running Sun Sleeves for arms will air dry quickly because of the fabric blend we use. Our Guarantee to You If for any reason you are not satisfied, we will gladly accept your return of new (unworn/unwashed) or defective merchandise within thirty (30) days of purchase. Blocks Harmful UV RaysNo Slip GripperWick Away Comfort Fabric MADE IN USA!Protect your skin from the elements with a pair of our MILER full arm sleeves for running! Note: No slip gripper at the top of each arm sleeve for running contains some latex.