Just thought i would share my experience with recently purchased Sidi Crossfire 2 boots. Having found a great price O/S I made the purchase and eagerly awaited their arrival. When they finally arrived i tried them on and they were somewhat snug (width wise). I thought i could wear them around the house hoping they just needed to stretch a little. Well after a few days, no stretching and bloody sore feet. I then commenced the web advice/help search with no luck. It would appear you can't stretch the Sidi's as they are made from Lorica. I rang a local shoe repair shop and he said they same thing. Well i have to say i was extremely deflated by this stage. I was contemplating a couple of options including sending them back or selling them locally. I then came up with the idea inserting a bike tube into the boots and inflating them. I made a round disc out of ply and drilled a hole through the middle. This allowed the valve to pretrude out and ack as a plug in the boots. After successfully inflating the boots i took to them with a heat gun in the area that required the stretching. After considerable heat i allowed them to cool and remain inflated for a couple of days. I deflated the tubes and removed them, again allowing them to settle another day to see if they would constrict again. I tried them on after the above process and success!! Stretched perfectly and no more sore feet. If you've had the same problem with your boots give the old bike tube in the boot trick a go. You will need to make the ply plugs otherwise the tube will commence to inflate up the boot leg. Cheers Zeppa.