If you need advice on the best material for your spa cover, give Universal Foam Products a call on 410-498-0000 where we can advise on the best thickness and density of EPS (expanded polystyrene) to keep in the heat. EPS sheets when incorporated into a spa cover or hot tub cover can add the insulation and protection you need in a lightweight solution. EPS products can also be tapered and shaped easily to fit a lot of different hot tub and spa shapes and sizes for manufacturers. We ship nationwide from more than 100 locations and are always available for our expertise and advice.