Do yaks get brittle in neg zero temps???

I'll be up at Eagle Lake the week of X-Mas. Its been getting down to negative 8 at night. I'm wondering if my P15 and Malibu 2XL will survive; crack/split, basically leave me swimming in 39' water.

Doubt it, they're made of more or less the same stuff as milk jugs, and milk jugs hold up fine in the deep freeze when I make ice blocks.    I'd worry more about harder plastic.

Mine's been fine when fishing in the snow..

Z