Are there conference chairs available for heavier users above 300 lbs?

Yes — bariatric or heavy-duty conference chairs with weight capacities of 400–500 lbs exist in the commercial furniture market. These chairs have reinforced bases (often 5-star heavy-gauge steel), thicker cylinder pistons, wider seat widths (22"–24" vs. standard 18"–20"), and denser seat foam. Some look identical to standard conference chairs; others have a more obvious heavy-duty profile. It's important to have at least a few of these in any conference room used by a broad employee population. FindOfficeFurniture.com can source high-weight-capacity conference chairs — call 888-719-4960 for the best deals.