Boots

I have been betrayed by my boots. An external seem has started to come undone. It progressed significantly further at 50km. I am debating if I need to buy trainers incase they give up the ghost in the last 40km (yes that is all that is left to go). I have gaffer tape and crocs. They might get me through. But is it a risk worth taking???? If it rains I will be somewhat stuck.