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A panel having particular utility in a chair or other apparatus for receiving an occupant in a seated position includes an envelope of resilient material having an opening with a fastener for closing the envelope. An envelope support frame is substantially rigid and formed in a closed loop. The enve

A panel having particular utility in a chair or other apparatus for receiving an occupant in a seated position includes an envelope of resilient material having an opening with a fastener for closing the envelope. An envelope support frame is substantially rigid and formed in a closed loop. The envelope support frame is positioned inside the envelope to tension the resilient material of the envelope in one or more tension zones. A fastener is closed to envelop the envelope support frame with the resilient material. The width of each tension zone when the envelope is in a its relaxed state is different than the width of each immediately adjacent tension zone.

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1. A panel comprising:an envelope of resilient material, said envelope having an opening with a fastener for closing the envelope; and an envelope support frame being substantially rigid and formed in a closed loop, said envelope support frame being positioned inside said envelope and tensioning the

1. A panel comprising:an envelope of resilient material, said envelope having an opening with a fastener for closing the envelope; and an envelope support frame being substantially rigid and formed in a closed loop, said envelope support frame being positioned inside said envelope and tensioning the resilient material of the envelope in a plurality of contiguous tension zones wherein each tension zone is stretched to a predetermined tautness that is different than the tautness of each immediately adjacent tension zone; wherein said fastener is closed to envelop the envelope support frame with the resilient material. 2. The panel of claim 1 wherein said envelope of resilient material is tensioned in a common direction within each of the tension zones.3. The panel of claim 1 wherein the tension in a first tension zone is about 65 pounds per inch and the tension in a second tension zone is about 10 pounds per inch or less.4. The panel of claim 1 wherein the tension in a first tension zone is about 65 pounds per inch and the tension in a second tension zone is about 35 pounds per inch or less.5. The panel of claim 1 wherein the width of each tension zone when the envelope is in a relaxed state is different than the width of each immediately adjacent tension zone.6. The panel of claim 1, further comprising a chair frame attached to said envelope support frame.7. A multi-layer support panel comprising:an envelope of resilient material, said envelope including: a first layer of the resilient material in opposed relation to a second layer of resilient material; and an opening with a fastener for closing the envelope; and an envelope support frame being substantially rigid and formed in a closed loop, said envelope support frame being positioned inside said envelope and tensioning each layer of the resilient material of the envelope in a plurality of contiguous tension zones wherein each tension zone is stretched to a predetermined tautness that is different than the tautness of each immediately adjacent tension zone; wherein said fastener is closed to envelop the envelope support frame with the resilient material, said second layer of resilient material providing overload support when loading on the first layer of resilient material causes said first layer of resilient material to contact the second layer of resilient material. 8. The panel of claim 7 wherein said envelope of resilient material is tensioned in a common direction within each of the tension zones.9. The panel of claim 7 wherein the tension in a first tension zone is about 65 pounds per inch and the tension in a second zone is about 10 pounds per inch or less.10. The panel of claim 7 wherein the tension in a first tension zone is about 65 pounds per inch and the tension in a second tension zone is about 35 pounds per inch or less.11. The panel of claim 7 wherein the width of each tension zone when the envelope is in a relaxed state is different than the width of each immediately adjacent tension zone.12. The panel of claim 7 further comprising a chair frame attached to said envelope support frame.13. A support panel comprising:an envelope of resilient material, said envelope having an opening with a fastener for closing the envelope; and an envelope support frame being substantially rigid and formed in a closed loop, said envelope support frame being positioned inside said envelope and tensioning the resilient material of the envelope in a plurality of substantially parallel tension zones wherein each tension zone is stretched to a predetermined tautness that is different than the tautness of each immediately adjancent tension zone; wherein said fastener is closed to envelop the envelope support frame with the resilient material. 14. The panel of claim 13 wherein the tension in a first tension zone is about 65 pounds per inch and the tension in a second tension zone is about 10 pounds per inch or less.15. The panel of claim 13 wherein the tension in a first tension zone is about 65 pounds per inch and the tension in a second tension zone is about 35 pounds per inch or less.16. The panel of claim 13 wherein the width of each tension zone when the envelope is in a relaxed state is different than the width of each immediately adjacent tension zone.