Holiday Planning & Ideas Valentine's Day Valentine's Day Crafts Needle-Felted Heart Mug Cozy Felting intertwines wool fibers with each prick of a barbed tool. Here, wool roving is easily transformed into an adorable mug cozy that keeps your drink warm and your hands protected. By Martha Stewart Editors Martha Stewart Editors Facebook Instagram Twitter Website An article attributed to "Martha Stewart Editors" indicates when several writers and editors have contributed to an article over the years. These collaborations allow us to provide you with the most accurate, up-to-date, and comprehensive information available.The Martha Stewart team aims to teach and inspire readers daily with tested-until-perfected recipes, creative DIY projects, and elevated home and entertaining ideas. They are experts in their fields who research, create, and test the best ways to help readers design the life they want. The joy is in the doing. Editorial Guidelines Updated on January 26, 2018 Share Tweet Pin Email This idea comes from our contributor Kara Whitten. For more ideas, scroll through our entire collection of Felting Projects and Tutorials. What You'll Need Materials Felting needle tool (Pictured: Felting needle tool, $17, clover-usa.com) Wool roving, 2 ounces of each color per cozy Needle-felting mat Button Sewing needle Thread Instructions Measure the circumference of your mug: Lay down your roving onto the needle-felting mat, ensuring that it fits the length of the circumference of your mug. Use several strips of roving to create a band that is approximately 2 to 3 inches wide. Felt the roving by repeatedly pricking the fibers all over with the needle tool until it starts to bind together and become matted. Continue along the length of the roving strips. (This process will take about 10 minutes of felting.) Choose a coordinating roving color and use it to form a heart, the word "love," or any other chosen design. Felt the patterned roving until it melds with the felted band. Once your piece has become one dense piece, trim off any excess from the sides, top, and bottom of the band. Using a piece of excess trimmed felt, attach the piece onto the band in a loop. Sew a button onto the opposite side of the band. Then, slip the cozy around your mug and fasten it closed with the button and loop.