UK pillow protectors and pillowcases share the same standard size: 50 × 75cm (20 × 30 inches). That is cut slightly larger than the pillow itself — a standard UK pillow is 74 × 48cm — so the case slides on without flattening the filling. The protector zips or envelopes over the bare pillow first; the pillowcase goes over the top. Square/Euro cases are 65 × 65cm and Super King cases 90 × 50cm.
| Item | Size (cm) | Size (inches) | Fits |
|---|---|---|---|
| Standard pillowcase / protector | 50 × 75 | 20" × 30" | All standard UK pillows (74 × 48cm) |
| Super King pillowcase | 90 × 50 | 35" × 20" | Super King pillows |
| Square / Euro case | 65 × 65 | 26" × 26" | Square continental pillows |
The protector takes the sweat, oils and allergens so the pillow itself stays cleaner for longer.
Pillows absorb moisture and skin oils nightly and are hard to wash properly; a quilted protector is machine-washable, adds a comfort layer, and meaningfully extends pillow life. For allergy-prone households, wash protectors at 60°C — the temperature needed to kill dust mites (per NHS/Allergy UK guidance — see the Allergy UK website).
Yes — standard UK pillows are 74 × 48cm and standard protectors are cut at 50 × 75cm, so one protector size fits them all.
Deliberately. A protector cut to the exact pillow size would compress the filling and flatten the loft. The extra couple of centimetres lets the pillow sit inside at full height.
Monthly at 60°C for allergy protection; the pillowcase weekly.
They add a thin cushioned layer — most people find it slightly softer; it doesn’t affect firmness.
No — it prevents future flattening from moisture but can’t restore lost loft; replace the pillow instead.
The protector is a washable barrier layer worn under the case; the case is the outer cover you sleep on.
Written by the Posh Tag team. Published 13 July 2026. Last updated 14 September 2026.
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