Although they are a bit pricey, they are very well made of canvas with a vented area at the bottom. They are water repellant and generously sized. We have a 5 piece resin sectional and were able to cover all with 2 loveseat covers (we needed a little creative positioning to accommodate the odd 5th piece but it fit completely under the cover). Just a note that it is NOT recommended keeping the cushions stored under the cover (to avoid mildew issues). Store them separately.