The seat of a Comfortable Training Chair with Armrests is typically designed to be comfortable for long - term use. It's usually contoured to fit the shape of the human body, with a slightly concave shape that helps to distribute the user's weight evenly. The seat may be padded with high - density foam, which provides a cushioned feel and reduces pressure points. The upholstery material can vary, but it's often a durable fabric or vinyl. Fabric upholstery is more breathable and offers a softer touch, while vinyl is more resistant to spills and stains, making it a good choice for a high - traffic training area.