Three function screen. Makes it 100% dark for a good sleep, ventilates the boat to keep moisture out and the mosquito net protects you from bugs. Keeps out moon- and sunlight and with mosquito net / screen it also keeps out mosquitoes, sand flies, No-See-Ums, gnats, flies, wasps etc. Easy to mount and fast with magnet from inside, under 5 seconds. Even children can do it. No drilling and fixed installations. Thin, builds less than 3 mm. Choose your size, small, medium or large. The blind fits all brands. Enjoy your life onboard your sailboat or motorboat with a good sleep. Waterline Designs blinds with ventilation are designed with the function to make it dark inside boats for a good night sleep and also ventilates the boat without letting in mosquitoes or other bugs. We believe that you need to have dark inside the boat to have a good sleep. Often, it's dark when you go to bed, but the sunrise can be very early and wake you up. It's easy to fall asleep on a boat and have pleasant dreams but you should be in charge of when you wake up. We have designed our blinds with ventilation as a three-layer product. Two layer of blackout material that are overlapped of each other by a few centimeter to still let air in and one-layer of dense mosquito net for keeping bugs out. The blinds work both on open and closed hatches. They mounts from the inside of the boat, so no one has to go outside to put anything on from the outside. Just attach a suction cup or a magnet (a metal plate is attached with double-sided tape on the window) on the hatch. The blind has a chromed steel frame (foldable) that stretches it out. The screen is tightened against the frame of the hatch by a cord attached to the magnet. Done in a few seconds. After use the blind net can easily be folded down to a 1/3 of its size for storage. Are you looking for a way to achieve 100% blackout while enjoying good sleep, ventilation and protection against mosquitoes? Look no further! The Waterline Design Boat shades for Hatches is designed to provide you with Mosquito net, Ventilation and dark cabin in the same product. Made from a premium blend of quality materials like dense Polyester mesh, PVC, chromed steel frame and brass grommet materials and quality craftsmanship, these hatch blinds guarantee maximum efficiency for years to come. It utilizes a 3-layer system that allows Mosquito net and 100% blackout in the same product without compromising on ventilation. The combination of the two layers of curtain/blind and one layer of mosquito net darkens and lets air through while keeping the mosquitoes out of the boat. Coming in an ergonomic design, it features one or two magnets to allow easy mounting from the inside. This design makes it easy to use, even for the most basic users. A metal plate with double-sided tape is used to allow the magnet to attach on the hatch window. Works on both open and closed hatches. What makes this boat hatch blind your best choice