Get total body support and comfort with an office chair that delivers smooth edges. A full function side tension adjustment offers a proper 2 to 1 ratio synchro control. A distinct mesh back offers a curve in the chair’s profile, and complements the proprietary foam in the soft cushion well. The 4-way durable elastomeric mesh offers aeration to prevent undue sweating. Run II chairs do not compromise on anything. You still get our ergonomic proprietary foam that gives you support where you need it, but softer at the edge to avoid restricting your circulation. (The RunII model offers a larger seat size, offering a bit more room as you get seated.) Choose the type of arms you need, and check out all 7 mesh colors offered.