Orangebox's Spina task chair designed by Yasuhiro Nakamura, uses a special elastomer to reduce heat retention and moisture collection, and increasing back contact and support. The upholstered version, uses special fabric as to not negate the effects of the elastomer.

Spina’s ‘Passive Seat Slide’ (PSS) mechanism allows the seat to sink backwards, bringing the sitter’s body towards the lumbar. Simultaneously, the Active Lumbar Support (ALS) automatically moves forward, triggering a feeling of comfort in the lower back, hips and pelvis.
These two mechanisms function in one seamless, harmonious movement, so Spina is always perfectly tuned to the individual. With it's PSS and ALS mechanisms, Spina provides spontaneous, supportive seating, even when changing postures, reclining or leaning forward. All without any need for manual adjustment. By harnessing our natural compulsion to move, users don’t have to be taught how to ‘drive’ the chair. Spina lets you sit naturally, subconsciously but always supported.