Sihoo B100 Chaise de bureau ergonomique avec accoudoirs relevablesTargeted sacral support helps stabilize your posture from the base up Breathable pressure relief mesh keeps you cool through long seated hours 3 position recline up to 135 makes it easy to switch from focus to reset A wide 2D headrest gives your neck and head a more comfortable place to rest Flip up armrests help save space and fit smaller work setups Ergonomic seat shaping reduces pressure on the hips, thighs, and behind the knees Class 4 gas lift