The coat of a Cornish Rex is extremely fine and sometimes curly, the softest of any cat breed. However, their light coat means that they are best suited for indoor living in warm and dry conditions, they might get hypothermia if they stay outdoors in the winter. Their body temperature is slightly higher than most cats (102 F), and these cats tend to hang around light bulbs, the tops of computer monitors, and other warm places including laps and shoulders. Some Cornish Rexes also have a mild cheesy smell peculiar to the breed; this odour comes from scent glands in the paws.
Often the breed is referred to as the Greyhound of the cats, because of the sleek appearance and the galloping run characteristic of the breed. These cats tend to stay playful and kittenish throughout their long lives. Some Cornish Rexes like to play fetch, race other pets, or do acrobatic jumps. The Cornish Rex is an adventurous cat and is very intelligent. It can readily adapt to new situations and will explore wherever it can go, jumping into refrigerators, examining washing machines, etc. Some humans consider its antics to be deliberately mischievous. The Rex is extremely curious, seeks out the company of people and is friendly towards other companion animals. It is a suitable pet for timid children.
Cornish Rex cats come in a wide variety of coat colours and patterns, outlined in the standard solids, including white, black, chocolate, orange and the dilutes blue, lilac and cream; all forms of tabby including classic, mackerel and ticked tabbies, bicolor "tuxedo" coat in many colours, tortoiseshell, "smoke" colours and the elegant colour-point pattern standard in the Siamese breed.
Despite some belief to the contrary, the Cornish Rex's short hair does not make it non- or hypo-allergenic. Allergic reactions from cats are not the result of hair length, the true culprit is a glyco-protein known as Fel d1, produced in the sebaceous glands of the skin, saliva, and urine. Most people who have cat allergies are reacting to this protein in cat saliva and cat dander: when the cat cleans its fur, the saliva dries and is transformed into dust which people breathe in. Since Cornish Rex cats groom as much as or even more than ordinary cats, a Cornish Rex cat can still produce a reaction in people who are allergic to cats. However, it is widely reported to cause lesser to little allergic reaction. It is recommended potential owener visit a cattery to check their own tolerance. Note that, for more serious allergies, there are several breeds theorized to lack or produce less of the offending protein.