I tested them in the range from about 0-20, and they were fine, above 20 they start to get soft.
They aren't designed for below zero, we have tested a sub-zero ball, but we couldn't have got it in time for this winter, and didn't want to sit on so many balls that wouldn't get sold for another 9 months, so we'll do them in the autumn.
Saying that, these should be fine to play with below zero, just they will be more likely to split than a true sub-zero ball.
I tested them in the range from about 0-20, and they were fine, above 20 they start to get soft.
They aren't designed for below zero, we have tested a sub-zero ball, but we couldn't have got it in time for this winter, and didn't want to sit on so many balls that wouldn't get sold for another 9 months, so we'll do them in the autumn.
Saying that, these should be fine to play with below zero, just they will be more likely to split than a true sub-zero ball.