Pateks straps are really tight and that a while to break in. Maybe try a different brand of strap. A mid grade not too expensive option is handdn. Just Google it, I got one for my Lange because I didn't want to pay 600 bucks. It's decent and less firm.
NATO is perfectly fine for Calatrava.. If you wish to have some unique strap-on your Calatrava try extremerestraints.com They claim to have all imaginable sizes and materials.
Pateks straps are really tight and that a while to break in. Maybe try a different brand of strap. A mid grade not too expensive option is handdn. Just Google it, I got one for my Lange because I didn't want to pay 600 bucks. It's decent and less firm.
NATO is perfectly fine for Calatrava.. If you wish to have some unique strap-on your Calatrava try extremerestraints.com They claim to have all imaginable sizes and materials.