Abstract: Ergonomic support members formed of and contoured to a corrected spinal curvature of an individual. The matrix provides the rigid support necessary for correction of the spinal curvature by gradual realignment with continued use of the support members, and may have channels for optional forced air flow, for heating and cooling and comfort of the individual during sleep or rest. Each support member is closely contoured to have a concave cross-section dimensioned according to the serial cross sections of a respective body section (e.g. head, shoulders, thorax, pelvis, and legs) while laying supine. The resulting contour of the support member thus provides the necessary convexity to evenly distribute body weight along the entire longitudinal axis of the spine and thereby provide corrective support for the spinal curvature. In the transverse plane, the contour forms a snug concavity wrapping up the sides of an individual.

Abstract: A readily detachable and fully rotatable coupling between a mast and sailboard is described, comprising a male portion with a circumferential groove, and a female portion with a recess to receive the male portion, and spring-biased tongues extending into the recess for engagement with the circumferential groove. The tongues are manually retractable for purposes of either engagement or disengagement of the mast from the sailboard.