Transparent materials with impact resistance are highly demanded in many applications including electronic devices, safety enclosures, vehicle and building windows. Current materials used in these applications, such as glass and transparent polymers, are often weak in damage tolerance, leading to catastrophic failure under impact. We propose a bioinspired transparent composite that reproduces the toughening mechanisms involving sacrificial bonds and hidden lengths in spider silk. This material consists of an elastomer matrix and an instability-assisted 3D-printed fiber fabric with sacrificial bonds and alternating loops. Under impact, the hidden loops unfold after the breaking of sacrificial bonds and gracefully resist the impactor penetration even after the matrix cracking. The large-scale plastic deformation of the unfolding loops significantly increases the energy dissipation and leads to a hysteresis as high as 95%. Our approach opens up new avenues for the design and manufacturing of high-energy absorbing composites for impact protection applications.