Hello, the Puma Vitoria FG/AG cleat's pattern is designed to hold the foot tightly like standard football cleats. If your boyfriend normally wears a size 42 and you want a slightly more comfortable fit to prevent his feet from feeling tight, I recommend getting a size 42.5. In this way, it will provide a suitable grip and you will not experience a feeling of squeezing in your foot. If you want, you can also consider a size up, number 43, but 42.5 should be your first choice. You can check exact measurements from the size chart on the product page. � �