Are tonneau covers waterproof?

Retrax's own warranty page says the cover is not waterproof, and its lifetime replacement on the RetraxPRO XR excludes water intrusion at any location. Roll-N-Lock excludes leaks from normal use. Pace Edwards, whose electric covers cost $2,800 to $2,937, excludes water intrusion at any location. Worksport's SOLIS warranty excludes leaks into the bed. Peragon's FAQ says the Landmark will leak if left in a steady rain for a long time. The most common complaint in the category is the one these warranties carve out.

Owner reports match, and point at the side rails. A BAKFlip MX4 owner called it water resistant, not waterproof. A 2025 Tacoma owner could see daylight where the MX4's rails fail to overlap the bed. An UnderCover Ultra Flex owner traced leaks to rail weather-stripping that does not compress and fixed it with $8 of foam seal. Another Tacoma owner said the Toyota-branded cover made by BAK has never leaked and has different dimensions from the MX4, which suggests fit matters as much as design.

Retractables are not exempt. A Roll-N-Lock A-Series owner who drilled the drain tubes reported very little leakage, nearly all at the corners. The strongest sealing claim in the sources is one DiamondBack owner's leak test. Keep anything water-sensitive in a sealed box, and read the water clause before relying on the warranty.