Concerning the inner boot layer- is it removable, or is it permanently attached to the bottom? if not, I'd assume the fit is tight enough so that it is secure- is that true?

Tech Specs:

Shell Material:

high-tenacity nylon, anti-dragging felt, aluminum; [gaiter] elastic cordura; [liner] Polyamide Thermic 

Waterproofing:

Schoeller Dynamic with water repellant membrane 

Sole:

Vibram, Impact Brake System 

Crampon Compatibility:

automatic 

Insulation:

insulated PE 

Lacing:

standard, waterproof zip cover 

Weight:

2 lb 3 oz 

Recommended Use:

high-elevation alpine mountaineering, ice climbing 

Manufacturer Warranty:

1 year