I have these for all our beds (various sizes). Can confirm they are comfortable, good fit and deffo waterproof (the kids sure have tested them ). I paid between £14.99 and £23.99 for our ones.
The super king sized bamboo mattress protector measures 180 cm by 200 cm - fits up to 30 cm deep; fitted cover style design with elastic all around.
Designed with your comfort in mind, this mattress protector features a blend of 30% viscose rayon derived from bamboo and 70% ultra tech polyester having 340 GSM Fabric.
Provides durable construction and protection; keeps your mattress dry since it is waterproof.
Machine wash cold or warm on gentle cycle; tumble dry low; do not iron; do not bleach; do not use fabric softener.
Great for those with kids, pets, allergies, asthma, eczema or incontinence.