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Interlock knits are made with a double knit and are often heavier than their cousin, the jersey knit. Because of this double knit quality, interlock is usually double-sided with a four-way stretch. This versatile fabric is better for more structured knit fabric projects such as exercise clothes or form-hugging dresses. We especially love interlock for leggings since its thick, structured nature keeps you warm and comfortable. Order with confidence with our easy, no hassle returns policy.