Comfort is related to complex interactions between fabric, climatic, physiological and psychological variables. Comfort performance is evaluated objectively, using procedures ranging from bench-top instrumentation to full-scale garment tests. Fabric properties, such as thermal and tactile, associated to one's comfort perception are measured objectively using appropriate instruments. The Kawabata Evaluation System (KES) measures critical fabric mechanical and surface qualities used to predict clothing comfort. Sweating skin models are employed to assess heat and moisture transport through test materials. The combined effects of fabric properties and other variables on total comfort are gauged by through subjective evaluation using human subjects. Subjective evaluations, performed under controlled environmental conditions, are designed to obtain responses that relate back to the instrumentally measured physical properties. Conducted at both the fabric and garment levels, human evaluators make ratings using specially chosen descriptor terms related to feelings of comfort and to certain fabric physical properties.