Thickest Hot Tub Covers: 6"-4" Tapered with 1.0# (R23.85-R37)
Product Review (submitted on October 4, 2012):
we are very happy with our cover. it fits perfectly, and arrived with no damage. Cynthia and Kira worked very hard to make sure we had the right fit for our odd shaped hot tub. thanks alot, you guys are awesome.