This is my first post on here so be kind!! I am 6ft 4 and ,although ive not weighed myself for a while, I must be about 15 ish stone. I have never had any real issues with size in any cave, although I consider myself to be quite flexible! I have only had to ask for a pull one and that was in a section of flower pot in Carlswark! That was tight! Hope that might re assure you a little!