3 season covers are insulated with dual foil faced foam core low E insulation.
4 season adds another layer of 3M Thinsulate on the inside of the cover. Resulting in almost double the thickness of a 3 season cover.
All covers are still fully functional for storage and use.
Yes. With all insulation more is more. It performs better in all conditions.
All Covers are magnetic except the front windshield which is held in place by the sun visors.