Free UK delivery over £40.00 43 colourways across the range Trade accounts

Bedding guide

Waterproof Mattress Protector 30cm Extra Deep: sizes, colours and how to choose

13 June 2026

The Waterproof Mattress Protector 30cm Extra Deep is one of the mattress protectors we stock at Daffodil Collections. It sits in our Waterproof Protectors range, and this is the short version of what you need to know before you choose a size.

How to choose

There are three kinds and they are not interchangeable. A quilted protector adds a little padding and absorbs the ordinary damp of sleeping. A waterproof one has a membrane and is what you want under a child, a pet or anyone unwell. An encasement zips all the way round and is the only one that addresses dust mites or a mattress you want sealed.

Whichever you choose, the skirt depth has to clear your mattress — and a protector is a consumable: it is cheaper than a mattress and it is meant to be replaced.

The sizes it comes in

UK bed names are consistent between retailers; what is not consistent is the mattress underneath them, so measure yours before ordering. These are the sizes this one is made in, with the mattress each is cut for.

SizeThe mattress it fits
Single90 x 190 cm (3ft x 6ft 3in)
Small Double (4ft)120 x 190 cm (4ft x 6ft 3in)
Double135 x 190 cm (4ft 6in x 6ft 3in)
King150 x 200 cm (5ft x 6ft 6in)
Super King180 x 200 cm (6ft x 6ft 6in)

If your bed falls between two of these, size up: a fitted sheet that is slightly generous tucks, and one that is slightly tight pulls its corners off in the night.

The options

It is made in Standard (48 x 74cm). Those are the merchant's own measurements rather than a standard, so compare them against what you are replacing rather than against a size name.

What the numbers mean

30cm is the depth of the item itself. On a topper that is the number that decides how much it changes the bed: a few centimetres soften a mattress that is close to right, where a deeper one is what you reach for when the mattress underneath has gone hard.

Looking after it

A waterproof membrane is the part that needs care: wash warm, never hot, and tumble on low or line dry. High heat is what lifts the laminate off the backing, and a protector that has delaminated is a protector that has stopped working without looking any different.

Always follow the care label on the item itself where it differs from this — the label knows what is in the fabric, and we would rather you trusted it than us.

For hotels, B&Bs and holiday lets

Bedsheets for hotels and B&Bs are washed at a temperature and a frequency no household matches, so the things that matter are the seams, the elastic and how the colour holds. That is why the hospitality trade buys in quantity and in one colour: a matched stock of quality hotel beddings is what makes a linen cupboard workable.

If you are buying for a business, our trade account is where the wholesale beddings pricing lives — the terms are on that page and they are read from the account, not from this article.

Where it sits in the range

The current price is on the product page below, and it is the price you pay — we are not VAT registered, so nothing is added at the checkout.

Looking for something else in the same line? The journal index has our guides to mattress protectors, and the product page carries the full specification, the stock position and the delivery estimate for your postcode.

In this guide

What we recommend