I am very impressed with my BB wool wrap. DS has a BBB with an extra booster and the wool wrap at night and that combo has never leaked! It easily lasts 12 hours. I started using this set-up after he leaked through sposies night after night. I didn’t lanolise the wrap either, I just used it as it came. I air it out during the day and after a few weeks I still haven’t washed it and it doesn’t smell at all.