To use these Castelli bib shorts, simply put them on like regular cycling shorts. The bib part goes over your shoulders. They're great for cycling on cool fall days or colder days when paired with knee or leg warmers. When it comes to care, wash them in cold water with mild detergent. Avoid using fabric softeners as they can damage the fabric's protective properties. Hang them to dry instead of using a dryer. This will help keep the Nano Flex 3G fabric and the embossed logos in good condition. Also, check the seat pad regularly for any signs of wear. With proper care, these shorts will last you a long time and keep you comfortable during your rides.