Extra Deep Fitted Sheets

Fitted sheet keeps popping off the corners? Your mattress is probably deeper than the sheet. SAIMAZ extra deep fitted sheets come in two pocket depths: 25 cm for most standard UK mattresses and 40 cm for deep pocket-sprung, pillow-top and memory foam mattresses – or any bed with a topper on it.

Every sheet has all-round elastic so it grips under the mattress and stays smooth all night. Made from soft, easy-care polycotton that washes well and resists fading and shrinking. Available in Single, Double, King and Super King, in a wide choice of colours to match your bedding.

Not sure which depth you need? Measure from the bottom seam to the top seam of your mattress, including any topper – our mattress depth guide shows you how.

Free UK delivery in 2–4 working days and free 30-day returns on every SAIMAZ order.

Frequently asked questions

What depth of fitted sheet do I need?

Measure your mattress from the bottom seam to the top seam, including any topper. Up to 25cm deep, choose our 25cm pocket; between 25cm and 40cm, choose our 40cm pocket. Our mattress depth guide shows how to measure.

Will it still fit if I use a mattress topper?

Add the topper to your mattress depth. For example, a 25cm mattress with a 4-inch (10cm) topper measures about 35cm, so a 40cm extra deep fitted sheet is the right choice.

What sizes are available?

Both our 25cm and 40cm extra deep fitted sheets come in UK Single, Double, King and Super King. The extra deep frilled valance sheet comes in Single, Double and King.

What is the difference between a fitted sheet and a valance sheet?

A fitted sheet covers the mattress only. A valance sheet is a fitted sheet with a gathered frill that hangs down to hide a divan base or under-bed storage.