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Summary: Shaving a chinstrap, which is a line of facial hair from the sideburns across only the chin, may require the use of a single blade to keep the edges crisp. Shave a chinstrap using the Gillette Fusion Precision Trimmer for a perfect line every time.
"A chin strap beard consists of long sideburns that connect just under the chin. Maintain yours with a single blade to shape along the jawline."
eHow Article: How to Shave a Chinstrap