Is a 4 cm topper thick enough?

For most applications, 4 cm is sufficient, especially if your mattress is structurally sound but feels slightly too firm. 

• 4 cm (Tuur® Mono Topper): subtle adjustment, ideal as an entry-level solution
• 8 cm (Tuur® Original Topper): for a clearly too firm mattress or more pressure relief
• Side sleepers with broad shoulders generally benefit more from 8 cm