Floor mats comprising two layers bonded together with an undulating boundary between them. The surface color and/or surface texture of the first layer being different from the surface color and/or surface texture of the second layer. The mats having an interlocking periphery boundary adapted so the mats can be interlocked with adjoining mats to form a continuous planar mat flooring.

A permeable surface covering unit comprises a top surface and at least two pairs of irregularly shaped mating sides, one or more passageways extending downwardly from the top surface, and at least one under channel connected to the passageways for retaining liquid, such as storm water. The sides of the unit preferably define an irregular rotational tessellation element. The passageways may comprise gaps or side cavities between units and/or core cavities or other passageways within the unit. Optional undercuts may be provided in the core cavities. Pervious material plugs are cast into the cavities extending into the channel or undercut. Thereby the plug is locked into the cavity like a rivet and resists being dislodged by mechanical or hydraulic forces. A permeable surface embodiment comprises a combination of pervious and impervious units, wherein the ratio of permeable to impermeable units and resulting surface absorption rate may be adjusted.

A dual-unit paving system for covering a surface is provided. The system comprises pairs of first and second units. For each pair, the first and second unit have different respective shapes and sizes, and are configured to be matingly engageable for forming a hexagonal assembly having six, non-linear sides. The hexagonal assembly allows forming rotational tessellations. The first and second units are also shaped and configured to be matingly engageable so as to form horizontally aligned tessellations, and also vertically aligned tessellations.

A heatable module for use in constructing a pathway for traffic comprises a base member having a perimeter edge. A top plate is securable to the base member in overlying relation to the top surface of the base member. An electrically powerable heater member retained by at least one of the base member and the top plate. To form a heatable pathway for traffic, the modules are placed in perimeter-edge-to-perimeter-edge relation one to the next.

An impact-absorbing assembly includes a covering layer being one or more of artificial turf, rubber mats, polymer mats, short pile carpeting, particulate infill, wood chips, and ground rubber chips. Also included is a layer of underlayment panels positioned beneath the covering layer. The panels have a panel section with a plurality of drain holes formed therethrough. A top surface of the panels is configured to support the covering layer. A bottom surface of the panels has a plurality of bottom projections that cooperate to define bottom channels suitable to permit water flow across the bottom surface, the bottom channels being in fluid communication with the panel drain holes. The bottom projections define a first spring rate characteristic that is part of a first stage and a second spring rate characteristic is part of a second stage, the first stage having a smaller volume of material than the second stage.

A paving system for paving or flooring includes a top layer of a plurality of paving elements, and an underlayment support layer of a polymeric material configured into panels. The panels are suitable to support the paving elements, the panels having a generally planar support surface.

Disclosed is a grass protection mat comprising a body where grass passing spaces are continuously arranged and an outer frame comprising four frames formed in four directions to finish an outer edge of the body, wherein the grass protection mat further comprises at least one hook fastener which horizontally protrudes from a first lateral frame of the outer frame toward a second lateral frame of an outer frame of a neighboring grass protection mat, and wherein the at least one hook fastener is fastened to at least one fastening hole provided in the outer frame of the second grass protection mat adjacent to the first lateral frame and corresponding to the hook fastener of the grass protection mat.

A dual-unit paving system for covering a surface has pairs of first and second units. For each pair, the first and second unit have different respective shapes and sizes, and are configured to be matingly engageable for forming a hexagonal assembly having six, non-linear sides. The hexagonal assembly allows forming rotational tessellations. The first and second units are also shaped and configured to be matingly engageable so as to form horizontally aligned tessellations, and also vertically aligned tessellations.

Various embodiments for a pad that may be combined with other similar pads to form a padding layer of an athletic field, or other surface, are disclosed. The pad includes a top surface and a bottom surface. Bottom-side projections are positioned on the bottom surface of the pad. Water channels are positioned on the bottom surface of the pad defined as a recessed area between individual ones of the bottom-side projections. A drainage hole is positioned in at least one of the bottom-side projections such that the drainage hole does not connect with any of the water channels on the bottom surface.

Various embodiments for a panel that may be combined with other similar panels to form a padding layer of an athletic field, or other surface, are disclosed. The panel for use in a padding layer of a panel system includes a top side having a center configured to support a top layer, the top side having a surface that slopes downwards from the center of the top side to edges of the panel, where the top side comprises top-side projections having a height varied from other ones of the top-side projections. The panel includes a bottom side having a plurality of bottom-side projections and a drainage hole that fluidly couples top-side projections with bottom-side projections.