Golf club head with undercut and insert

An iron-type golf club head comprising:

• an iron-type golf club head body and an insert;
• the iron-type golf club head body comprising:
• a front portion and a back portion, a top portion comprising a top rail, and a bottom portion comprising a sole;
• a strikeface comprising a strikeface front surface located at the front portion and a strikeface rear surface located opposite the strikeface front surface towards the back portion, the strikeface further comprises a geometric center, a strikeface perimeter;
• and a thickness measured from the strikeface front surface to the strikeface rear surface;
• wherein a rear perimeter extension extends rearwardly from the strikeface perimeter;
• wherein the strikeface rear surface and the rear perimeter extension cooperate to define a back cavity;
• an insert comprising:
• an adhesive layer, an elastomeric layer, and a cap;
• wherein the insert is configured to be received within the back cavity and adhesively attached to the strikeface rear surface;
• wherein the adhesive layer consists of a single, unbroken piece;
• wherein the elastomeric layer comprises a first plurality of portions, and the cap comprises a second plurality of portions;
• wherein the first plurality of portions are aligned with the second plurality of portions;
• wherein one elastomeric layer portion and one cap portion form an insert section such that each of the first plurality of portions is paired with a different cap portion, and such that each of the second plurality of portions is paired with an individual elastomeric layer portion such that the insert comprises a plurality of insert sections;
• wherein the plurality of insert sections are separated one from another by gaps such that none of the plurality of insert sections are directly connected one to another;
• wherein the plurality of insert sections are not identical in shape;
• wherein the gaps are defined by uncovered areas of the adhesive layer.