Pearl Izumi SUN KNEES UV Knee SleevePearl Izumi Sun Knees are proven to deliver UPF 50 protection even when the fabric is stretched by 30%, the lightweight material used for these slip on knee covers will keep you covered and cool so you can lay down the hammer at the height of summer. InRCool technology to provide optimal skin cooling effect and moisture management when you perspire ELITE Transfer fabric with UPF 50+ sun protection and Ice fil Easy slip on fit BioViz reflective