Convenient sport like clothes which should be worn under the overall (overalls can be rented)
Shoes on slip-resistant (soft rubber) soles
A hat to protect your head from dirt and blows (bandana or some hat)
Gloves
It is recommended to have knee-caps
Sleeping bag (can be rented)
Slippers for Speleohouse
Personal hygiene products (toothbrush, toothpaste, shampoo, shower gel, etc.)
Towel
In rainy weather, you should be ready to pass a boggy path from Speleohouse to the cave, ~ 15 min