I ordered this in two sizes. 4x6 arrived perfect. No odor and excellent quality. Really love it. 3x5 arrived with powerful odor of mildew or chemical. I requested a replacement which took less than five minutes. A replacement is being sent with no return required. I don't understand how the same product can smell so differently. I avoid chemical treatments when I can so not happy about the potential mildew/chemical. BUT, love the 4x6, it smells great - like dried grass - and love the ease of replacement. Hoping new one has no odor. GREAT customer service.