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In one aspect, a seat includes a perimeter frame and a weight bearing surface. The perimeter frame includes a front frame member, two contoured lateral frame members, and a contoured rear frame member. Each lateral frame member has a front portion, a second portion proximate the user's thighs, a con

In one aspect, a seat includes a perimeter frame and a weight bearing surface. The perimeter frame includes a front frame member, two contoured lateral frame members, and a contoured rear frame member. Each lateral frame member has a front portion, a second portion proximate the user's thighs, a concave curve portion proximate the user's pelvis, and a rear portion, the bottom of the concave curve portion being lower than the second portion and lower than the rear portion. The rear frame member has a central dip portion. The weight bearing surface on which the user sits includes a plurality of straps attached to the perimeter frame. Other aspects relate a method for making a seat and a method for fitting a seat to a user.

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1. A seat on which a user sits, the seat comprising: a perimeter frame comprising: a front frame member;two contoured lateral frame members, each lateral frame member having a front portion, a second portion proximate the user's thighs, a concave curve portion proximate the user's pelvis, and a rear

1. A seat on which a user sits, the seat comprising: a perimeter frame comprising: a front frame member;two contoured lateral frame members, each lateral frame member having a front portion, a second portion proximate the user's thighs, a concave curve portion proximate the user's pelvis, and a rear portion, a bottom of the concave curve portion being lower than the second portion and lower than the rear portion; anda contoured rear frame member having a central dip portion; anda weight bearing surface on which the user sits, the surface comprising a plurality of straps attached to the perimeter frame. 2. The seat of claim 1 wherein the plurality of straps are configured in a tabby weave pattern. 3. The seat of claim 1 wherein an end of a strap is attached to the perimeter frame. 4. The seat of claim 1 wherein a strap is adjustably attached to the perimeter frame. 5. The seat of claim 1 further comprising padding overlying the weight bearing surface. 6. The seat of claim 1 wherein the front portion of each lateral frame member has a downward curve. 7. The seat of claim 1 wherein the second and rear portions of each lateral frame member are substantially straight. 8. The seat of claim 1 wherein a strap comprises a plurality of holes therein. 9. The seat of claim 8 wherein the plurality of holes are positioned throughout a length of the strap. 10. The seat of claim 1 wherein the weight bearing surface comprises a plurality of woven flexible straps. 11. The seat of claim 10 wherein the plurality of woven straps are longitudinally inelastic. 12. The seat of claim 1 wherein the weight bearing surface has a depression proximate the concave curve portion of the lateral frame members and proximate the central dip portion of the rear frame member. 13. The seat of claim 1 installed on a wheelchair after-market. 14. The seat of claim 1 integrated into the design and construction of a wheelchair. 15. The seat of claim 1 wherein the perimeter frame is rigid. 16. The seat of claim 1 wherein the weight bearing surface comprises a plurality of transverse straps orthogonally intersecting a plurality of longitudinal straps. 17. A method of making a seat comprising: weaving a plurality of flexible straps into a weight bearing surface and securing each of the straps onto a contoured perimeter frame, wherein the perimeter frame comprises: a front frame member;two contoured lateral frame members, each lateral frame member having a downward curving front portion, a substantially straight second portion proximate the user's thighs, a concave curve portion proximate the user's pelvis, and a substantially straight rear portion, a bottom of the concave curve portion being lower than the second portion and lower than the rear portion; anda contoured rear frame member having a central dip portion;placing a pelvic form on the weight bearing surface; andadjusting one or more straps to conform the weight bearing surface to the pelvic form. 18. The method of claim 17 wherein a pressure point between the form and the weight bearing surface is determined by tactile inspection of an underside of the weight bearing surface. 19. The method of claim 17 wherein a pressure point between the form and the weight bearing surface is determined by a visual inspection of an underside of the weight bearing surface. 20. The method of claim 17 wherein an end of a strap is attached to the perimeter frame. 21. The method of claim 17 wherein an end of a strap is attached to the strap. 22. The method of claim 17 further comprising attaching the seat to a wheelchair. 23. A method of fitting a seat to a user comprising: providing a seat comprising: a perimeter frame comprising: a front frame member;two contoured lateral frame members, each lateral frame member having a downward curving front portion, a substantially straight second portion proximate the user's thighs, a concave curve portion proximate the user's pelvis, and a substantially straight rear portion, a bottom of the concave curve portion being lower than the second portion and lower than the rear portion; anda contoured rear frame member having a central dip portion; anda weight bearing surface on which the user sits, the surface comprising a plurality of woven flexible straps having voids therebetween, wherein each strap is adjustably attached to the perimeter frame;seating the user on the weight bearing surface; andadjusting one or more straps to conform the weight bearing surface to the user, thereby forming a pelvic recess in the weight bearing surface. 24. The method of claim 23 wherein a pressure point between the user and the weight bearing surface is determined by tactile inspection of an underside of the weight bearing surface. 25. The method of claim 24 wherein the pressure point is detected by feeling for a taut or loose strap. 26. The method of claim 23 wherein a pressure point between the user and the weight bearing surface is determined by a visual inspection of an underside of the weight bearing surface. 27. The method of claim 23 wherein a flexible material is disposed between the user and the weight bearing surface. 28. The method of claim 27 wherein a pressure point between the user and the weight bearing surface is determined by tactile inspection of an underside of the weight bearing surface comprising feeling portions of the flexible material extending through the voids in the weight bearing surface. 29. The method of claim 27 wherein a pressure point between the user and the weight bearing surface is determined by visual inspection of an underside of the weight bearing surface comprising looking for portions of the flexible material extending through the voids in the weight bearing surface. 30. The method of claim 23 wherein providing the seat comprises: taking a first anatomical measurement of the user, with the user's knee bent about 90 degrees, corresponding to a length between a sacral region and popliteal knee region; andchoosing a seat having lateral side members compatible with the first anatomical measurement. 31. The method of claim 23 wherein adjusting the one or more straps comprises: taking a second anatomical measurement of the user, with the user's knee bent about 90 degrees, corresponding to a length between a sacral region and greater tronchanter; andpositioning the pelvic recess to be compatible with the second anatomical measurement. 32. The method of claim 23 wherein providing the seat comprises: taking a third anatomical measurement of the user corresponding to a length between left and right greater tronchanters; andchoosing a seat having front and rear frame members compatible with the third anatomical measurement. 33. The method of claim 23 wherein adjusting the one or more straps comprises: taking a fourth anatomical measurement of the user corresponding to a length between left and right anterior superior iliac spine members; andpositioning the pelvic recess to be compatible with the fourth anatomical measurement. 34. The method of claim 23 further comprising inserting a pressure mapping device between the user and the weight bearing surface. 35. The method of claim 34 wherein a location on the weight bearing surface is determined by touching an underside of the weight bearing surface to temporarily increase a pressure reading of the mat corresponding to that location.