Ballooning - Ballooning is where the duvet protector traps air or water inside the protector that can’t escape.
When air is trapped ballooning makes for a very uncomfortable night.
When water is trapped when machine washing and drying duvet protectors, its virtually impossible to machine wash or dry the protector.
The cover has a 2” fine mesh gusset that runs along the sides of the duvet liner. This stops ballooning allowing air to escape when on the bed, and water to escape during machine washing and drying. It's possible liquids can get into the duvet thru the gusset – but, that’s unusual. The top fabric is a soft polyester that actually absorbs liquid (doesn’t bead) so the liquid can’t drip into the duvet or mattress (still not going thru the protector).