Full-Grain and Top-Grain Versus Split Leather. The typical leather hide is split into two parts. The surface layer, the layer closest to the animalâs hair, is called the top-grain layer. The lower layer is called the split layer. In our industry, full-grain leathers, which include both layers, are the most desirable. The natural markings on the hide are attractive, and so it is not necessary to correct the surface appearance of the leather in any artificial manner. Top-grain leather is slightly less desirable.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  ha(Verb) Alternate spelling of a. 2  ha(Interjection) A representation of laughter. 3  ha(Interjection) An exclamation of triumph or discovery. 4  ha(Verb) Alternate spelling of a. 5  Ha(ProperNoun) An ethnic and linguistic group based in Kigoma Region in western Tanzania.
HA is a sugar that occurs naturally in your tissues (including skin) and is most commonly known as the lubricant in your joints. The HA that is Juvederm and Restylane is synthetic, meaning that it is manufactured and not harvested from any animal. It has been modified by a process called cross-linking.