How to Choose a Memory Foam Seat Cushion for Your Office Chair

By TushGuard Team, October 2, 2026

An office chair cushion should fit your chair and your day. Use this checklist to compare options before you buy.

Check the size first

Measure your seat width and depth. The TushGuard Large is 18.11 x 14.17 inches, the X-Large is 18.11 x 16.14 inches and the XX-Large is 18.5 x 16.92 inches. A cushion that overhangs the seat edge can slip, so choose a size that sits fully on the chair.

Think about thickness

Thickness runs from 3.15 to 4.13 inches across our sizes. A thicker cushion raises your seating height, so check that your feet still rest flat and your desk height still works.

Look for a U-shaped cutout

A contoured cutout leaves space under the tailbone area, which is why a coccyx seat cushion is popular for long sitting.

Choose a cover you can clean

A breathable mesh cover with a zipper can be removed and machine washed, which keeps the cushion fresh.

Do not forget the base

A non-slip bottom keeps the cushion from sliding when you stand up and sit down.