US: 42 to United Kingdom Size 34

US: 42: Corresponds to a waist size of 105 $\text{cm}$ (42 $\text{in}$), total strap length of 120 $\text{cm}$ (47.2 $\text{in}$), and recommended fit classification Relaxed / Comfortable.

United Kingdom Size 34: Corresponds to a waist size of 85 $\text{cm}$ (34 $\text{in}$), total strap length of 100 $\text{cm}$ (39.4 $\text{in}$), and recommended fit classification Standard / Regular.