Be careful with these Boa laces
Having had a previously positive with TNF Ultras I needed a new pair of shoes for a 62.5 mile endurance event and made the mistake of switching to the Endurus XCR Boa. On the second of 2 relatively short training runs the Boa laces broke and I had to return the shoes. I then reverted to a pair of Ultra XCR 103s which were excellent both in training and over the 62.5 miles. In summary I would save the premium and go for (the slightly cheaper) TNF Ultra 103 XCR over the TNF Endurus XCR Boa.