Impact protection system

A wearable impact protection system including:

• a) an inner layer of a first shear thickening material that faces a wearer in use;
• b) an outer layer comprising separate sheets formed of a second shear thickening material;
• c) an intermediate deformable layer;
• d) a join defined where the sheets of the outer layer overlaps, the join having a portion that protrudes into the intermediate layer;
• wherein the impact protection system further includes:
• a plurality of cells provided in a tessellated arrangement, the plurality of cells including at least first and second cell shapes, adjacent cells being shaped to at least partially overlap;
• wherein the plurality of cells are mounted on a substrate layer and comprise first and second cells, wherein the first cells each include an internal impact absorbing foam layer wholly contained within, wherein the second cells include an upper triangular surface and side walls extending downwardly and outwardly from a perimeter of an upper surface to a triangular base having a larger footprint than the upper surface, the second cells having corner cut-out, the first and second cells being positioned so that each second cell is surrounded by three first cells with the first cell side walls abutting against the second cell side walls, the second cells being smaller than the first cells so that corner walls of the first cells are provided in opposition;
• and
• wherein side walls of the second cell have a slope at less of an angle than side walls of the first cells so that the tessellated arrangement has an overall concave underside and a convex upper side conforming to a head of a user.