As with all retractable truck bed covers, the Peragon cover is not 100% waterproof. You will get minor leaking along the sides of the cover, where the panels meet the rails. You may also notice small amounts of water entry at the front of your bed and your tailgate.
The aluminum panels are sealed against each other with automotive quality EPDM rubber seals. Retractable covers offer unmatched flexibility for hauling and security, but they are not waterproof. When traveling with water sensitive items - like tools & electronics - we recommend using totes for additional protection.