Cold Process Soap: What the Suds Is That?

Clean skin starts with clean ingredients. At Goodlather, we take soap back to basics — the way it was meant to be made. Our bars are handcrafted using the cold process method, a traditional technique that takes time, patience, and a whole lot of care. Here’s why we believe slow and steady makes for better soap (and happier skin).

What Is Cold Process Soap?

Cold process soap is made by combining natural oils or fats with lye (a type of alkali) in a reaction called saponification.

What makes it different? We don’t add heat. Instead, we let the reaction’s natural warmth do the work. Once poured into molds, the soap cures slowly over several weeks, allowing it to harden, mellow, and develop the rich, creamy texture you know and love.

This careful, slow process preserves the nourishing qualities of the oils, resulting in a gentle, moisturizing soap that leaves skin soft, smooth, and comfortable — perfect for sensitive skin and everyday use.

An example of a person pouring a purple batch of soap using the cold soap method from a pitcher into a white rectangular soap mold on a kitchen counter, surrounded by sliced lemons, oranges, and other cold process soap ingredients.

How It Differs: Hot Process Soap

Hot process soap takes the same ingredients but turns up the heat — literally. The mixture is cooked to speed up the saponification process, meaning it’s ready to use in just a few days instead of weeks.

While that makes it faster, it can also break down delicate oils and reduce their natural skincare benefits. Cold process soap takes the slower route, but in return, it preserves the integrity of every oil and botanical.

It’s the difference between slow-brewed coffee and instant — both get you clean, but one just feels a little more special.

A person holds a glass container with diced candle pieces to put into a black pot on a gas stove, preparing to add them to a boil. The scene, is the process of creating hot processed soap. Goodlather is a firm believer that hot processed soap isn't great for your skin since it takes away all the good stuff nature has to offer in it's ingredients.

What About Melt-and-Pour?

Melt-and-pour soap starts with a pre-made base that’s melted down, mixed with color or scent, and poured into molds. It’s simple and fun — great for crafters or beginners — but not quite the same as making soap from scratch.

Because the base is already processed (and often includes synthetic additives or detergents), it lacks the rich, natural feel and moisturizing properties that cold process soap delivers.

Think of it as the shortcut version of soapmaking — convenient, but not crafted with the same depth or care.

A close-up of several cubes of already made soap chopped up and placed in a black bowl, an example of melt and pour soap making that Goodlather doesn't do.

Why We Choose Cold Process

At Goodlather, we believe good things take time. Each bar is carefully mixed, poured, and left to cure for weeks — no shortcuts, no added heat, no unnecessary extras. Just pure, natural ingredients doing what they do best.

The result is a soap that’s gentle, hydrating, and long-lasting — made to clean without stripping your skin’s natural balance.

Because when it comes to good, clean fun… we like to keep it slow, intentional, and honest.

A woman in a black bikini enjoys water flowing over her head from a stone fountain in an outdoor pool, eyes closed and hands on her neck, savoring the softness of sunlight and greenery—like a moment of pure calm with goodlather cold process soap.

Ready to feel the difference?

Shop our Cold Process Soap and experience the Goodlather way. Each of our soap bar products are crafted with pure ingredients with everybody and every body in mind.