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Almost all adipose tissue in adults is the called yellow adipose tissue.

Yellow Adipose Tissue
Yellow adipose tissue is composed of tightly packed cells whose chief
feature is a large lipid droplet surrounded by a thin layer of cytoplasm
containing a flattened eccentric nucleus. All the cellular organelles are
closely associated with the nucleus. Adipose tissue is very vascular, has a
supportive network of reticular fibers and a network of nerves. In response
to the body's needs for energy, lipids are mobilized first from subcutaneous
(under the skin), mesenteric (around intestine) and retroperitoneal (around
kidney) deposits. Cells shrink as the lipids are removed to become
polyhedral or spindle shaped. The cells remain adipocytes and do not convert
into other connective tissue cell types.

Brown Adipose Tissue
In human infants and other mammals, a second type of adipose tissue is
present called brown adipose. It has numerous mitochondria and is
specialized to generate heat when directly stimulated by the sympathetic
nervous system. A mitochondrial protein called thermogenin uncouples the
proton pump such that the energy is not stored in ATP but is dissipated as
heat. The two types of adipose tissue do not transform from one to another
and there is little of this thermogenic fat in the human adult.