whay do cats shead soo much

They are cats. Take a look at this web page about shedding.

Source Link: http://www.cathealth.com/shedding.htm

All animals shed some. It’s a way of keeping the fur or hair healthy, by dropping old fur/hair and growing new fresh fur. Even animals with feathers or scales shed, though it is called “molting” with these kinds of creatures. Most animals shed twice a year and it is seasonal and caused by the changing weather.

Now if your cat has a problem with EXCESSIVE year-round shedding, it may have a food sensitivity (allergy) and you might need to try a gluten or grain-free food.

they do it when its hot because-they cant keep all there fur in hot places!,they will get to hot,thats why they shed in hot places