textile-based protective equipment such as knee and elbow pads and wrist guards with sensing performance can not only ensure comfort and freedom of movement but can also monitor human health and record exercise data in real time. Therefore, an investigation of textile-based smart materials with sensing and impact protection is desirable.Smart fabrics with sensing properties have been of interest to researchers in recent years because they are flexible, lightweight, comfortable, and breathable. [4] Various sensing mechanisms based on capacitive, resistive, or piezoelectric measurements have been used to develop smart fabric sensors. [5] Textile-based pressure sensors have also been proposed for a variety of applications, including wearable health monitors, intelligent homecare devices, and human motion detectors. [6] However, most of the fabrics currently used in textilebased smart sensors are 2D, and usually cannot be used for simultaneous impact protection. However, 3D fabrics can be used as substrates for textile-based sensors because they have excellent compression properties. Some 3D spacer fabric-based sensors have been developed in recent years. Conducting materials, such as poly(3,4-ethylenedioxythiophene):polystyrene sulfonate, [7] carbon nanotubes, [8] and carbon black, [1] are often used to modify spacer fabrics for textile-based sensor devices. Some researchers have also sandwiched a spacer fabric between two separate layers. The layers include passive antennae and ferrite film units, [9] or single-walled carbon nanotubes/silver paste electrode layers, [10] which produce a difference in inductance. Although some progress has been made in the research of 3D smart fabrics, several critical issues have yet to be addressed. These include limited functionality, complex manufacturing processes, and a lack of systematic research on simultaneous sensing and impact protection.Herein, we combined a 3D spacer fabric and a graphenebased aerogel for the first time to fabricate a multifunctional composite that overcomes the poor mechanical properties of graphene-based aerogels and the nonconducting properties of spacer fabrics. We will demonstrate a simple method comprising filling the spacer fabric with the graphene-based aerogel to produce a conductive composite. The spacer fabric confers impact protection. Therefore, the obtained 3D spacer fabric composite is multifunctional and has broader applicability. We successfully demonstrated a strain/temperature sensor based on the 3D spacer fabric composite that is thermally insulating A multifunctional composite composed of a spacer fabric and a porous graphene-based aerogel is proposed for sensing and impact protection applications. The combination of the mechanical properties of the spacer fabric and the electrical properties of the graphene-based aerogel provides a versatile composite material with a strain sensitivity of 1.48, a temperature sensitivity of −0.004 °C−1 , and a protection factor of 45%. The material is also lightweight, hydrophobic, and thermally in...