What does the ErgoPromise Lifetime Guarantee mean by lifetime?

“Lifetime” does not mean your lifetime. Rather, “lifetime” refers to the lifetime of the product and its component materials. While we strive to use exceptional materials in our products, all materials wear out and deteriorate over time with use and exposure to natural elements, and a product’s lifetime is based on its usage in accordance with its instructions, how well it is cared for and how old the product is.