What were you doing on a roof? I have taken not one but two tumbles. Fortunately both were single story and I happened to have my fall broken by shrubbery. I no longer go on roofs where the pitch is greater than an 8/12...That's about 25 degrees.IF you don't want to work in the winter you better go to Florida or Texas. Otherwise you work no matter how bad the weather is. THis comes form a guy sitting at home with a busted leg after falling off a roof.