Moisture-barriered, body-contact protective interface structure

1. A body-contacting interface structure comprising

a core, viscoelastic, acceleration-rate-sensitive cushioning structure, formed of a compressible, non-springy, viscoelastic, urethane foam possessing a load-response behavior which (a) resists sudden-movement rapid compression, yet (b) is less resistive to slow-movement compression, wherein the urethane foam behavior is degraded when exposed to water-based moisture, and

a moisture-barriering container surrounding and encapsulating said cushioning structure, operable to block the flow of all moisture from all regions outside said container to the inside thereof while accommodating bidirectional gas permeability of all non-water-based gases for the cushioning structure inside said container.

2. The interface structure of claim 1 which further comprises a moisture-wicking structure surrounding said container.

3. A body-contacting interface structure comprising

a core, viscoelastic, acceleration-rate-sensitive cushioning structure, formed of a compressible, non-springy, viscoelastic, urethane foam possessing a load-response behavior which (a) resists sudden-movement rapid compression, yet (b) is less resistive to slow-movement compression, wherein the urethane foam behavior is degraded when exposed to water-based moisture,

a moisture-barriering container surrounding and encapsulating said cushioning structure, operable to block the flow of all moisture from all regions outside said container to the inside thereof while accommodating bidirectional gas permeability of all non-water-based gases for the cushioning structure inside said container, and

a moisture-wicking structure surrounding said container.