I use the Spa cover cap in the winter, makes snow removal easier.
Ice and slush tend to just slide off with ease compared to just the cover and there
is less of a chance of ripping your expensive cover.
Also in the cold months I use a good thermal blanket.....its more work but
seems to keep the heat in better.
Oh both of these were purchased from RHTubs, this is my second season...so far so good !
John