Quick answer
Choose Madeira Cotona 80 for delicate piecing and fine quilting on cotton fabrics; choose Aerofil 35 for heavy-duty seams on denim, canvas, or leather.
Thread weight and material: The core difference
The biggest difference between these two threads is their weight and material, which directly affects the look and strength of your stitches. Madeira Cotona 80 is an 80-weight, 2-ply cotton thread, making it very fine and thin. This is ideal for piecing small patches, stitching intricate designs, and creating a subtle, flat seam that doesn't add bulk. In contrast, Aerofil 35 is a 25-weight polyester thread, which is much thicker and stronger. This makes it perfect for projects where durability is key, like quilting with denim or sewing heavy fabrics.
The material also matters for the final look. Cotton thread, like the Madeira Cotona 80, has a matte finish and blends beautifully with natural fibers. Polyester thread, like Aerofil 35, has a slight sheen and is more resistant to abrasion and chemicals, making it a better choice for items that will see heavy use or frequent washing.
When fine cotton thread works best
Madeira Cotona 80 is crafted from extra-long staple, double-mercerized Egyptian cotton. This gives it exceptional strength for its weight and a smooth, lustrous finish. Because it's so fine, it's a go-to for precision work like paper piecing, miniature quilts, and topstitching on delicate fabrics. It also reduces thread buildup in seams, making it easier to press your quilt blocks flat.
When heavy-duty polyester thread is the answer
Aerofil 35 is designed for heavy-duty seams. Its 25-weight construction is extra strong, making it suitable for sewing heavy woven fabrics, leather, and canvas. If you're making a quilted jacket, a bag, or a project using denim, this thread will hold up to the stress. The included 'Jean Colors' assortment is a practical choice for decorative stitching on denim, where you want the thread to stand out and define the seams.
How to choose: The trade-offs
- For fine piecing and cotton quilts: Use Madeira Cotona 80. Its fine weight and cotton material ensure your seams lie flat and your stitches blend into the fabric.
- For heavy fabrics and durable seams: Use Aerofil 35. Its thick polyester construction provides the strength needed for denim, canvas, and leather projects.
- For decorative topstitching: Aerofil 35 is the better choice. Its thicker weight and variety of jean colors make it stand out on seams, especially on denim or heavy woven fabrics.
Product facts at a glance
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Madeira Cotona 80 - Premium Cotton Quilting & Sewing Thread - 218 yds: 80-weight 2-ply premium cotton, extra-long staple double-mercerized Egyptian cotton. This fine, strong cotton thread creates nearly invisible seams and a flat finish, ideal for precise piecing and quilting on lightweight cottons.
Madeira Cotona 80 - Premium Cotton Quilting & Sewing Thread - 218 yds
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Aerofil 35 Extra Strong - Assortment Box, 110-yard (100m) spools, 8 Jean Colors: 25-weight extra-strong polyester, available in an assortment of 8 'Jean Colors'. This thick, durable thread is built for heavy fabrics like denim, canvas, and leather, making it the right choice for projects that need strong, visible seams.
Aerofil 35 Extra Strong - Assortment Box, 110-yard (100m) spools, 8 Jean Colors
Which thread fits your project?
Best for
- Precise piecing and quilting on lightweight cotton fabrics
- Projects requiring a fine, flat seam and a matte finish
Not for
- Heavy-duty seams on denim, canvas, or leather
- Projects where you want a thick, visible decorative stitch
