Swim fin with an upper portion having debossed regions and triple-bladed rails

A swim fin for wearing upon a foot of a user, the swim fin comprising:

• a foot pocket sized and configured to receive the foot of the user, the foot pocket having:
• a front section;
• a rear section;
• an upper portion formed of an elastomeric material, the upper portion having a dorsal region, and first and second debossed regions with the dorsal region disposed between the first and second debossed regions, each of the first and second debossed regions being laterally positionable adjacent the metatarsophalangeal joints of the foot of the user, each of the first and second debossed regions having a plurality of grooves formed therein;
• a sole;
• and
• a foot pocket cavity disposed between and defined by the upper portion and the sole for receiving the foot of the user;
• and
• a fin blade extending from the front section of the foot pocket, the fin blade having:
• a distal edge;
• a blade body portion disposed between the distal edge and the front section;
• and
• first and second triple-bladed rails disposed longitudinally along the foot pocket and the blade body with the foot pocket and the blade body disposed between the first and second triple-bladed rails, each of the first and second triple-bladed rails having a top blade, a bottom blade, and a middle blade disposed between the top and bottom blades.