Castelli was a pioneer in the field of waterproof thermal fabrics, realizing How useful are they for cycling? However, don't think that these knee pads are intended exclusively for driving in the rain on wet roads because the water-repellent fabric is also highly breathable making them a great option for cool, dry days as well. The best part is that if the sun comes out, they can be easily removed and put in a jersey pocket as opposed to full-length panties and tights.