Seat

1 . A seat for supporting a bottom of a seated user, which seat comprises a first seat part for supporting a first part of the bottom of the user and a second seat part for supporting a second part of the bottom of the user, wherein the first seat part is elastically deformable and has a first modulus of elasticity and wherein the second seat part has a second modulus of elasticity which is at least 10 times greater than the first modulus of elasticity, wherein the first seat part and second seat part comprise flexible straps extending between two frame parts, the two frame parts having a folded up position and a collapsed position, wherein, in the open position, the second seat part straps are tensioned to achieve the second modulus of elasticity.

2 . The seat according to claim 1 , wherein the first modulus of elasticity is smaller than or equal to 0.01 GPa.

3 . The seat according to claim 1 , wherein the second modulus of elasticity is greater than or equal to 0.1 GPa.

4 . The seat according to claim 1 , wherein the first seat part lies centrally relative to the seat and the second seat part surrounds the first seat part.

5 . The seat according to claim 1 , wherein the first seat part comprises the projected position of at least one of the pubic area, the coccyx or one or both sit bones of the user.

6 . The seat according to claim 1 , wherein the second seat part comprises the projected position of at least a part of the thighbones of the user.

7 . The seat according to claim 1 , wherein the flexible straps of the first seat part comprise at least one elastic strap.

8 . The seat according to claim 1 , wherein the first and/or the second seat part is covered with a soft foam layer.

9 . The seat according to claim 3 , wherein the second modulus of elasticity is in the range of 0.1-0.9 GPa.

10 . The seat according to claim 7 , wherein the at least one elastic strap is adjustable.