Zamberlan Hydrobloc Features:
Zamberlan Hydrobloc® Proofing Cream has been specifically formulated and developed for the Hydrobloc® Full Grain Leathers (smooth and waxy finished), to enhance their water resistance and appearance; it is also compatible with all other such leather from other manufacturers. Hydrobloc Cream is also suitable for Gore-Tex®-lined footwear, with Full Grain Leather uppers, as it will not affect the performance of the Gore-Tex® membrane. For Nabuk, Split-Grain or Rough Out Leather upper boots, or fabric boots, please use Zamberlan Hydrobloc® Conditioner Spray.
I've been using this boot waterproofer for years now and it does a brilliant job., Soaks in well, doesn't add much to the look of the original leather apart from a slight darkening.