Ground-engaging components for articles of footwear include: (a) an outer perimeter boundary rim that at least partially defines an outer perimeter of the ground-engaging component, wherein the outer perimeter boundary rim defines an upper-facing surface and a ground-facing surface opposite the upper-facing surface, wherein the outer perimeter boundary rim defines an open space at least at a forefoot support area of the ground-engaging component; and (b) a matrix structure extending from the outer perimeter boundary rim (e.g., the ground-facing surface and/or the upper-facing surface) and across the open space at least at the forefoot support area to define an open cellular construction with plural open cells across the open space at least at the forefoot support area, wherein a plurality (e.g., at least a majority) of the open cells have curved perimeters with no distinct corners.

Ground-engaging components for articles of footwear include: (a) an outer perimeter boundary rim that at least partially defines an outer perimeter of the ground-engaging component; (b) an inner perimeter boundary rim that at least partially defines an inner perimeter of the ground-engaging component, wherein a first open space is defined between the outer perimeter boundary rim and the inner perimeter boundary rim, and wherein a second open space is defined between a lateral side portion of the inner perimeter boundary rim and a medial side portion of the inner perimeter boundary rim; and (c) a support structure extending from the outer perimeter boundary rim to the inner perimeter boundary rim and across the first open space.

Ground-engaging components for articles of footwear include: (a) an outer perimeter boundary rim that at least partially defines an outer perimeter of the ground-engaging component, wherein the outer perimeter boundary rim defines an upper-facing surface and a ground-facing surface opposite the upper-facing surface, wherein the outer perimeter boundary rim defines an open space at least at a forefoot support area of the ground-engaging component; and (b) a matrix structure extending from the outer perimeter boundary rim (e.g., the ground-facing surface and/or the upper-facing surface) and across the open space at least at the forefoot support area to define an open cellular construction with plural open cells across the open space at least at the forefoot support area, wherein a plurality (e.g., at least a majority) of the open cells have curved perimeters with no distinct corners.

A spike and key system is provided that includes a spike having a conical tip with a hole extending therethrough, and a key member including a first key having a racetrack shaped opening, and a second key having a rotatable key member designed to interact with the hole in the spike.

A spike is operable to be removably coupled to an article of footwear. The spike includes a first portion that is substantially rigid. The spike also includes a second portion that is resilient.

A hiking shoe includes a vamp connected to an outsole. The outsole includes a rear section and a front section. The outsole has multiple anti-slip blocks formed thereto. Multiple spikes are respectively and integrally formed to a portion of the anti-slip blocks that are located at the rear section and the front section of the outsole. Each spike has an end face that is formed on the first end thereof, and the end face is in flush with the distal end of the anti-slip block corresponding thereto. The second end of each spike is located within the anti-slip block corresponding thereto and within the outsole. The end face of each spike has multiple grooves defined therein so as to provide friction. Each spike is made by SKD-11 (Steel Kogu Dies-11).

A sole structure for an article of footwear is provided and includes a first sole plate formed at least in part from a first material having a first stiffness and including a first ground-engaging portion and a second ground-engaging portion, the first ground-engaging portion defining a first aperture extending around the second ground-engaging portion. The sole structure further including a membrane coupled to the first ground-engaging portion and the second ground-engaging portion and at least partially exposed by the first aperture, the membrane formed at least in part from a second material having a second stiffness that is less than the first stiffness.

A spike is operable to be removably coupled to an article of footwear. The spike includes a first portion that is substantially rigid. The spike also includes a second portion that is resilient.

A spike is operable to be removably coupled to an article of footwear. The spike includes a first portion that is substantially rigid. The spike also includes a second portion that is resilient.

A spike and key system is provided that includes a spike having a conical tip with a hole extending therethrough, and a key member including a first key having a racetrack shaped opening, and a second key having a rotatable key member designed to interact with the hole in the spike.