As an alternative to polyaramid fibers, glass fibers have been used as mechanical enhancer for tough hydrogels. In a study by Yang and co-workers, PAAm/Alg-Ca 2+ double networks were supplemented with vinyl-functional glass fabrics. Firstly, the glass fabric was fixated in the center of the mold, followed by injection of the PAAm/Alg precursor solution and polymerization. Lastly, the composite gel was soaked in a 0.3 M CaCl 2 solution, leaving the final water content of the gel undisclosed. The latter showed strongly enhanced fracture energy and elastic modulus of Γ = 206.7 kJ/m 2 and E = 35 MPa, some of the highest combined values to date. The literature example that follows is primarily of instructive nature as it involves an elastomer with a water content of 0%. In the mentioned work by Gong and co-workers, a glass fiber fabric was embedded into a rubbery matrix with soft and hard segments to yield a strong viscoelastomer (σ b = 700 MPa). While its stretchability was reduced to a minimum (ε b = 12.5%), the elastomeric material exhibited extreme values for fracture energy and elastic modulus (Γ = 1400 kJ/m 2 , E = 6120 MPa). Conclusively, (nano)fibers may greatly enhance the fracture mechanics of tough hydrogels, however, their ductility often suffers greatly, especially when macroscopic fiber mats are inserted.