You could categorise the causes into two main camps.
- Physical conditions of the body.
- The footwear products worn.
The most common physical conditions are fairly obvious, such as
physical exercise and activity - such as running, playing sports
and walking. Another obvious cause is a warmer climate. The less
obvious cause are illness and stress: anxiety, a symptom of the
fight or flight response, produces sweat, and is theorised that
sweat is produced to make the body harder for a predator to grab
a hold of.
The other cause of feet sweating is footwear products: wearing
thick socks and a thick leather or canvas shoe in a warm climate
is obviously going to lead to feet sweating. However, the design
of a shoe's upper can play a large part in keeping the foot cool.
Manufacturer's often talk of breathabiliy: many sports shoe manufacturer's
have developed "mesh" materials for the sole purpose of
helping the foot breath and lower the buildup of sweat. Letting
a foot breath through air vents allows sweat to evaporate.
The problem with many materials - such as PVC plastics and rubber
- is that they are ideal for protecting the foot from weather condition's
- such as rain - but, are notoriously poor materials for letting
the foot breath.