Rigid polyethylene reinforced composites having improved short beam shear strength

Polyethylene filaments having a tensile modulus of at least about 500 g/denier, an energy-to-break of at least about 20 j/g, a tenacity equal to or greater than about 20 g/denier, a weight average filament diameter equal to or less than about 30 micrometers, an average filament aspect ratio equal to or less than 2.9:1 and a molecular weight of at least about 150,000.