The insulated cover is a cover filled with 100 mm polyurethane foam. The cover will shorten the heating time and can take the weight of heavy snow. We do not however recommend sitting or walking on the cover. The cover can be attached to the hot tub cabinet and also locked with a specific code so small children cannot open it. All covers are made especially for our own hot tub models, but some may also fit other hot tubs. If you need a cover for a hot tub that is not manufactured by us at Koriks-Fiiber, we recommend consulting with our salesperson.