What is Thickness?
Total height of the mattress.
Short answer
Thickness without density is meaningless — thick cheap foam still sags.
Thickness when buying a mattress
Total height of the mattress.
Why it matters: 6 inches suits light single sleepers; 8–10 inches suits most adults; heavier bodies need 10+.
Look for: Thickness without density is meaningless — thick cheap foam still sags.
Full Mattress buying guideThickness when buying a yoga & exercise mat
4 mm, 6 mm, 8 mm or more.
Why it matters: 4–5 mm balances stability and cushioning; 8 mm+ is for floor workouts and bad knees, not balance poses.
Look for: Very thick mats make standing poses unstable.
Full Yoga & Exercise Mat buying guide