We call that old school heavy weight denim Jeans. This is made with vintage selvage inspired blue and black denim fabric. The model of these jeans were the old styles as used by gold miners. Very tightly woven cotton fabric. These Denims will last long.
Fitting is a slim fitted classic cut 

• 5 pocket slim fit selvage denim
• Hidden rivets on back
• Zip fly
• Made in Japan