We keep a range of insulation suitable for most caving regions (except the very, very warm), and most constitutions. Experience suggests that a close fitting and quick draining layer works well for most people. As a guide, it is also good to avoid undue sweating; so if you find yourself drenched and cold on most of your trips, you might – paradoxically – be better off wearing a bit less. For what to do when you stop… see ‘warmwear’