BILLABONG DAY BREAKHey rider, here you can find everything you've to know about the BILLABONG DAY BREAK JACKET. DAY BREAK JACKET BILLABONG The DAY BREAK is a high quality BILLABONG WOMAN JACKET. The impermeability level is 10k (10000) mm of water column. A garment is definable waterproof if it holds up to 1k.