Experience showed that overheating was a problem in the Gemini space suits.
The Apollo space suits had a layer of fabric made of tubing through which cool liquid flowed.
A layer of linen provided some comfort, and the use of rubber, nylon, and aluminum ensured protection.
Life support had to be mobile, so a backpack with oxygen, cool water, and a power source was developed.
Apollo’s space helmets were attached to the suits, allowing more freedom of head movement without danger of leaking at the neck connection.
Boots were worn over the layers of the suit and had a special protective coating on the outside.