Sand Tan USA Cattlehide Sides for Upholstery or Garments with Stain Protection.  This is a typical upholstery leather with a surface that feels waterproof – and it is.  3.25 oz in thickness, or about 1.3mm.  Mellow temper, Chromium tanned.  These run about 21 sq ft each and are priced at $85 each, USA shipping included.  Note that for places like AK, HI, GU, PR etc your leather will be folded to fit in USPS flat rate boxes.