Quick answer: This is a pair of fins from Omega Aquatics.
For bigger divers, fin fit starts with the foot pocket. Size to the boot or bare foot you'll actually use, and look for a blade that matches your kick so you save air and energy.
Offered in 4 options, including Omega Aquatics Amphibian Flip Fins Medium (6/8) Black/Blue, Omega Aquatics Amphibian Flip Fins Large (9/11) Black/Yellow, Omega Aquatics Amphibian Flip Fins X-Large (11/14) Black, Omega Aquatics Amphibian Flip Fins Medium (6/8) Black.
Size to the boot you'll wear, not your street shoe. Wide or high-volume feet should lean toward the larger size, and open-heel fins give you the most room to adjust. Read How to Choose Scuba Fins for Comfort and Power. More options: Fins for Wide Feet & Larger Divers.