PRIMALS Merino Wool Boxer Brief

Well where do we start? The problem is standard underwears are:

• Made with polyester & elastane
• Contain toxic dyes
• BPA & microplastics
• PFAS & formaldehyde
• Sprayed with pesticides
• Constrict your package
• Erectile dysfunction & shrinkage
• Reduce testosterone & fertility

The toxic, endocrine disrupting and carcinogenic compounds used to produce modern underwear are absorbed through the sensitive areas that they cover. This is even more so the case when heat is applied like when you are exercising or are in the sauna. The key to never absorb such compounds is to wear all natural fabrics especially when it comes to underwear.

Here are some references:

• Toxic dyes: https://pubmed.ncbi.nlm.nih.gov/10523869/
• Chemicals in plastics: https://www.endocrine.org/topics/edc/plastics-edcs-and-health
• Cancer risks: https://dceg.cancer.gov/research/what-we-study/pfas
• Reduced fertility: https://pubmed.ncbi.nlm.nih.gov/8279095/
• Reduced testosterone: https://pmc.ncbi.nlm.nih.gov/articles/PMC8530230/

Our PRIMALS Merino Wool Boxer Briefs are made of:

• Body Fabric: 100% Merino Wool
• Waistband: 70% Organic Cotton, 30% Natural Rubber

People who make the switch to PRIMALS Merino Wool Boxer Briefs can expect to experience:

• Increased testosterone levels
• Improved reproductive health
• Improved blood flow & package function
• Increased comfort with moisture wicking and cooling effect thanks to Merino Wools' natural properties
• Restored hormone health
• Boosted masculinity & confidence

Here are some references:

• Fertility: https://pubmed.ncbi.nlm.nih.gov/8279095/
• Testosterone: https://pmc.ncbi.nlm.nih.gov/articles/PMC8530230/
• Organic vs Non-organic on fertility: https://www.sciencedirect.com/science/article/abs/pii/S037842741400040X

There are several "clean underwear" brands on the market, but what makes PRIMALS Merino Wool Boxer Briefs the undoubtable best?

While other "natural fiber" boxers on the market seem to be decent options - the issue is that the majority of them are not truly 100% natural. Many of these brands contain 5% elastane for the sake of marginal improvements in stretch. But the good news is PRIMALS Merino Wool Boxer Briefs are designed to have that same functionality and flexibility while staying 100% all natural with zero elastane or spandex.

And what takes PRIMALS Boxer Briefs above and beyond the rest is the waistband. While making an all natural waistband was seemingly impossible in the past - PRIMALS continues to push the boundaries of what is possible in the health & wellness space and we have created our waistband with 70% organic cotton and 30% natural rubber. That way even the waistband is all-natural and non-toxic which is certainly important when you wear underwear nearly 24 hours a day, and when in heat like during your workouts or in the sauna.

The fact is, if you take your long term physical, hormonal and reproductive health seriously - you cannot afford to settle for anything less than truly 100% all natural underwear. Our boxer briefs are designed for maximum comfort and performance while also using the cleanest materials possible. It's simply the best mens underwear on the planet.

So get yourself a pair, and you'll see exactly what we're talking about!

By Waist Size:

Small: 29-31 inches

Medium: 32-34 inches

Large: 35-38 inches

XLarge: 39-43 inches

XXLarge: 44-48 inches

When unsure about which size to choose, we typically recommend you select a size that's 1 size higher than you usually wear for a relaxed fit.

That way, if the boxer briefs are slightly bigger than you prefer, you can simply wash & dry them on a high heat setting, and they will slightly shrink to your perfect size!

Many people hear “wool” and assume it’s rough or scratchy - but Merino wool is completely different. PRIMALS uses fine-grade Merino fibers that are incredibly soft, thin, and smooth. These fibers are much finer than human hair, which allows them to bend easily against the skin without causing irritation, itchiness, or friction.

Merino wool naturally regulates moisture, which also reduces skin sensitivity. Unlike synthetics, it doesn’t trap sweat, bacteria, or heat, making it ideal for men with sensitive skin, eczema, or irritation from polyester. The fibers stay breathable and dry, preventing the damp, sticky environment that can cause itchiness in cheaper underwear.

Another advantage is that PRIMALS boxer briefs are made with non-toxic dyes and zero pesticides, unlike many cotton or synthetic fabrics that contain chemical residues. With PRIMALS, every material touching your skin is clean, natural, and safe.

The result: underwear that feels soft, cool, and comfortable - never itchy.

Absolutely. Merino wool is one of the best natural performance fibers in the world, making PRIMALS boxer briefs ideal for training, running, lifting, hiking, or any active lifestyle. Merino’s structure allows it to wick sweat away from the skin, keeping you dry without the cold, clammy feeling that synthetics often create after heavy exertion.

Unlike polyester, Merino doesn’t release microplastics, phthalates, or BPA when heated - meaning you can train confidently without exposing your skin to endocrine-disrupting chemicals. This is crucial because synthetic underwear becomes especially dangerous during exercise due to heat and friction, which accelerate chemical release.

Merino wool also has built-in odor resistance, staying fresher for longer, even during long workouts. And because PRIMALS boxer briefs use a 70% cotton / 30% natural rubber waistband, there’s no plastic-based compression trapping heat around your package.

The result? Pure performance without compromising hormone health.

You might be wondering what the difference between PRIMALS Boxers and PRIMALS Boxer Briefs are, and which one to pick?

PRIMALS Boxers:

• Body Fabric: 100% GOTS Certified Organic Cotton
• Waistband: Organic Cotton & Spandex
• Boxer = Looser more relaxed fit

PRIMALS Boxer Briefs:

• Body Fabric: 100% Merino Wool
• Waistband: Natural Rubber & Organic Cotton
• Boxer Brief = Snug, athletic fit

If you prefer a looser, more relaxed fit, then PRIMALS Organic Cotton Boxers should be your go to and you can get it here.

If you prefer a more snug, athletic fit and you're willing to invest in the absolute pinnacle of men's performance & health underwear then PRIMALS Merino Wool Boxer Briefs should be your go to.

That sums up the difference between the two, but most of customers opt to grab both our Boxers and our Boxer Briefs so they can choose what they wear based on their daily activities - relaxing around the house versus training hard.