The phrase "inner gel" refers to the soft and squishy substance found inside certain objects, like gel-filled cushions or mattresses. It is the inner part that provides comfort and support. Full definition
You don't want any of the green bitter part, just the clear inner gel. (girlfriendisbetter.com)
The pure inner gel extracted from the aloe leaf is the best natural remedy for skin abrasions and it also helps to diminish the symptoms of aging skin conditions. (healing4soul.com)
Chillmax Pillow's inner gel reacts to your body temperature to absorb excess heat, drawing it away from your skin to produce a natural cooling effect for up to three hours. (idealhome.co.uk)