How to Make an Oven Mitt with Insul-Bright (Heat-Safe Batting Guide)

If you've ever grabbed a hot roasting tin with a thin shop-bought mitt and felt the heat come straight through, you already know why this project is worth an afternoon. Learning how to make an oven mitt is one of those sewing skills that pays you back every single day, but only if you get the insulation right. The prettiest mitt in the world is useless if it can't stand between your hand and a 200°C baking tray.

Before I started Notches, I spent years making custom clothing and bridalwear and doing alterations, and if that work taught me anything, it's that the inside of a project matters as much as the outside. With oven mitts, the inside is everything. That's why my reversible double oven mitt pattern is insulated with both Insul-Bright and cotton batting, and why this post is as much a heat-safe batting guide as it is a sewing tutorial.

This double mitt is one long connected piece with a pocket at each end, so you can lift a hot dish with both hands, and each pocket has a proper thumb for a secure grip. It's fully reversible too, so you get two looks from one make. The video below shows you exactly how to make an oven mitt from start to finish.

One thing to know upfront: the download is the pattern template itself. For the how-to, follow the video — I made it so you never have to squint at written steps, and it walks you through every stage in real time, which honestly suits this project better than pages of diagrams would.

Why Insul-Bright, and Why It's Not Enough on Its Own

Insul-Bright is a needle-punched insulating batting with a metalized film running through it. That reflective layer bounces heat back towards its source instead of letting it pass through to your hand. It's the standard choice for oven mitts and pot holders for good reason.

But here's the part people miss: Insul-Bright reflects heat, it doesn't absorb much of it. For real protection you want to pair it with a layer of 100% cotton batting, which soaks up and slows the heat that gets past the reflective film. That's the combination this pattern uses, and it's the combination I'd recommend for anything that touches hot bakeware.

The other non-negotiable is fibre content. Everything in an oven mitt should be 100% cotton where possible: the outer fabric, the lining and the batting. Polyester can melt when it meets high heat, and a melted mitt against your skin is far worse than a burn through fabric. Save the poly blends for projects that stay away from the oven.

Materials for a Heat-Safe Mitt

• The pattern: the reversible double oven mitt PDF pattern. It's a PDF emailed to you after purchase, with the full video tutorial to sew along with — just print the pieces at actual size on Letter-size paper.
• Two coordinating 100% cotton fabrics: because the mitt is reversible, both fabrics show, so pick two prints you love together.
• Insul-Bright: the reflective insulating layer.
• 100% cotton batting: the absorbent layer that works alongside the Insul-Bright.
• Thread, scissors or a rotary cutter, pins or clips, and your sewing machine. Nothing specialist.

How to Make an Oven Mitt: The Sewing, Step by Step

Here's the shape of the project so you know what you're signing up for. For the details, cutting and construction, follow the video, because that's where the actual instructions live.

1. Print and cut. Print the pieces at actual size (don't let your printer scale them), then cut your fabric, Insul-Bright and cotton batting pieces.
2. Build your insulated layers. Layer the cotton fabric with the Insul-Bright and cotton batting so every part of the mitt that meets heat is properly protected.
3. Make the thumb pockets. The two hand pockets with thumbs come together at each end. The thumbs are what make this mitt so much more secure to use than a flat double mitt.
4. Assemble the full mitt. Join the pockets to the long centre panel, keeping your layers smooth as you go.
5. Finish the edges and press. A neat finish is what makes it reversible, so take your time here. In the video I show you how I handle the trickier sections.

My Tips for a Better Oven Mitt

Go slowly over the thick sections. You're sewing through multiple layers, so a slightly longer stitch and an unhurried pace will give you a much neater result than pushing the machine hard. If your machine has a walking foot, this is its moment.

Choose fabric you'll want to look at daily. This mitt lives on a hook or a countertop, not in a drawer. Since it's reversible, I like one bold print and one calmer coordinate, so the mitt suits two moods of kitchen.

Make two while you're set up. The cutting is the slow part. A second mitt in different fabric makes a lovely handmade gift, and this design was made with gifting and selling in mind. If you enjoy kitchen makes, my quilted placemat with binding tutorial pairs beautifully with this one for a matching set.

Oven Mitt Batting FAQ

Can I use regular batting for oven mitts?

Only if it's 100% cotton, and even then I'd use it alongside Insul-Bright rather than instead of it. Cotton batting on its own insulates, but the reflective film in Insul-Bright adds protection cotton can't match. Never use polyester batting in an oven mitt, because polyester can melt at oven temperatures.

Is Insul-Bright heat resistant on its own?

It reflects heat well, but one layer by itself makes a thin mitt. Pairing it with cotton batting, as this pattern does, gives you both reflection and absorption, which is what keeps your hands comfortable while a hot dish is in them.

Can Insul-Bright go in the microwave?

No. Insul-Bright contains a metalized film, and metal doesn't belong in a microwave. For microwave projects like bowl cozies, use 100% cotton batting, cotton fabric and cotton thread throughout. Keep the Insul-Bright for oven mitts and pot holders.

Ready to Sew Yours?

Once you know how to make an oven mitt properly, with the right heat-safe layers inside, you'll never go back to flimsy shop-bought ones. The pattern is beginner-friendly, the video covers every step, and the whole thing is an easy weekend win. Grab the reversible double oven mitt with thumbs pattern, and while you're at it, have a browse through my other kitchen and home sewing patterns for your next project. Happy sewing!