Method of manufacturing a foamed polymer product

A method for manufacturing at least one of a foamed polymer product (1), a shoe component, and a midsole of a shoe, having a series of openings (2), the method comprising the steps of:

• a. providing a foamed polymer preform (3) having a certain height, width and length and comprising a series of openings (2) extending into or through the preform (3)
• b. providing a compression mold (4) comprising a series of pins (5), a top (6) and a base (7), the top (6) and the base (7) being displaceable relative to each other between
• i. an open state in which the preform (3) is receivable in the compression mold (4), and
• ii. a closed state in which the compression mold (4) forms a cavity (8) defining a shape of the product (1);
• c. inserting the preform (3) into the compression mold (4) by sliding the preform (3) with the series of openings (2) onto the corresponding series of pins (5) of the compression mold (4);
• and
• d. shaping of the preform (3) in the compression mold (4) to form the product (1) having a compressed height, width and/or length by
• i. compressing the preform (3) inside the compression mold (4), by pressing the top (6) and the base (7) towards each other;
• and
• ii. heating of the preform (3) inside the compression mold (4).