It is a part of your safety shoe or safety boot that doesn’t get the attention it deserves. Again, a critical component that needs understanding in order to make an informed decision prior to your purchase. All shoes have a sole, which is the bottom of a shoe, the part that comes into full contact with the ground.
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Modern Soles can be made from a variety of materials, but most modern safety shoes have soles made from:
Prior to these compounds – during the 90’s – polyvinyl chloride (PVC) was popular. Today however, it is fairly rare and rather obsolete.
More than 90% of the safety footwear sold and purchased globally will be manufactured out of Polyurethane. Either single density or dual/double density. Dual density has become the global standard due to the fact it offers both a hard-wearing outsole (which takes the impact and pounding of the earth below) and a softer, more cushioned midsole. The midsole, being of a different shore hardness (Shore Hardness is a measure of the resistance a material has to indentation) allows spring and cushioning which provides comfort. Single density doesn’t have this best of both worlds scenario – so has to compromise on either the longevity of a hard wearing outsole or the comfort factor. This ends up either being very hard and inflexible… or not hard wearing enough.
Polyurethane injected soles in safety footwear; are intrinsically flexible, lightweight, antistatic, oil/acid/petrol & diesel resistant, slip resistant and has a heat resistance of around 90’ degrees to 110’ degrees (on better quality chemicals). Due to the massive quantities sold worldwide, it is the cheapest of the predominantly utilised compounds.
Thermoplastic Polyurethane soled product is more specialist; a little less flexible, very lightweight, oil/acid/petrol & diesel resistant, but slightly less slip resistant. It also carries a 90’ degree heat resistant but most importantly, it does have the impressive quality of being cut resistant. A nice feature. Due to its specialist nature – it does carry a price premium.
And that brings us to the heavy duty sole offering, which is Rubber. More expensive, heavier, but designed to take on the harshest work environments in construction, engineering and mining. It has a harder compound, offering a superior degree of both cut and puncture resistance, as well as resistance to some harsher chemicals. It also boasts a 300’ degree heat resistant outsole which also makes it non-conductive. Great for applications around both heat, extreme cold and electrical current.
At ProFit Safety Footwear we make use of a range of 5 different anti-static, dual density polyurethane soles – and 4 different heat-resistant and non-conductive rubber soles.
Whether it's your first time shopping for work boots or your hundredth, you might not think about midsoles when you're deciding which features to look for in your next pair. Sandwiched in between the outsole, which makes contact with the ground, and the insole, which makes contact with your feet, the midsole is literally the hidden secret of a good work boot. As the layer that binds the inner and outer parts of the sole together, the midsole is the most important part of a shoe or boot when it comes to absorbing shocks and protecting your feet from the routine stress of a job that keeps you on them all day long. Just like every other feature of a work boot, not all midsoles are created equal. So how do you decide what kind of midsole you need? Let's compare two of the most common midsole materials used in Thorogood's high quality work boots.
We wouldn't blame you if you glossed over these terms when you saw them in one of our product descriptions. They don't exactly roll off the tongue! So let's start with the basics, including the names and abbreviations themselves.
Polyurethane, or PU for short, is a class of polymers held together by a molecule called urethane. You probably come in contact with PU more than you think. Capable of being formed into a variety of structures, such as the fibers that make spandex clothing and the foam that makes up your typical household sponge, this material is found in everything from furniture to skateboard wheels.
Our second material, ethylene-vinyl acetate, is known as EVA for short. EVA is a man-made material made of microscopic bubbles that create a surprisingly resilient, yet flexible, structure. Like PU, EVA has many applications in the modern world. It’s probably a part of your weather-resistant car mats, mouth guards, and ice cube trays!
But which one of these materials do you want in a midsole?
No one wants midsoles that give out on them or don’t stand the test of time. If a long lifespan is important to you, keep reading.
For more information, please visit PU Sole Safety Shoes.
When it comes to durability and longevity, you can’t beat Polyurethane. This stuff is as tough as you are. It has a world-wide reputation of being resistant to wear and tear over extended periods. The long lasting power of this material makes it perfect for blue collar folks looking to not replace their boots frequently.
Although the durability is still good, EVA doesn’t stand the test of time quite like PU does. If you aren’t working in extreme weather, rough terrain, or unpredictable environments, this material can still be a great fit for your midsole! If you do find yourself in a rougher jobsite environment - EVA might not be the best option.
For most people who still work for a living, comfort is key when it comes to footwear. Let’s see which material helps keep your feet feelin’ good.
Similar to point one, PU just knows how to stand the test of time! This material offers superior shock absorption, providing excellent support during long hours of use. Perfect for that overtime shift or long week you’ll be working! What really makes Polyurethane stand out is that it maintains cushioning properties even with prolonged wear, ensuring consistent comfort.
If you like that “light as a feather” feel, EVA is your best friend. Ethylene-vinyl acetate is exceptionally lightweight with excellent shock absorption, ensuring comfort throughout the day. There’s only one downside: EVA may compress over time, but generally this material will continue to provide a soft and cushioned feel.
A big part of comfort comes from weight, especially if you work a job that requires a lot of movement. Ready to see which midsole will keep you light on your feet? Let’s take a look.
PU does have that robust support that many manual labor workers enjoy, especially in heavy-duty work environments. However, this material is no match for EVA as far as weight goes. With Polyurethane, you can expect to have a heavier feel to your work boot. PU does provide a balance between stiffness and flexibility, offering stability while allowing natural movement.
EVA definitely takes the cake on this one! Ethylene-vinyl acetate is significantly lighter than its PU counterpart, reducing your overall boot weight and minimizing fatigue. If you’re always on the move at work, EVA might be a dream come true for your ankles and legs. Less weight, more balance, extreme flexibility. It’s a win-win-win!
We know the kind of work you do doesn’t come with easy terrain. Whether it be muddy environments, sharp objects on the ground, chemicals or oil, you need boots that work as hard as you do. Let’s see the comparison!
Polyurethane is resistant to oil, chemicals, and abrasions, making it suitable for a variety of work environments. This tough material maintains structural integrity even when exposed to challenging conditions. If this sounds like your jobsite, PU might be the best move for your safety and comfort!
EVA is a light-weight and flexible material - so it’s not as hard hitting when we’re talking about protecting against harsh conditions. Generally Ethylene-vinyl acetate is less resistant to oil and chemicals compared to PU. Because it’s prone to quicker wear and tear in harsh environments, this midsole type is best suited for lighter-duty work.
Cost matters, especially when investing in a solid pair of work boots. We’ve listed the price comparison of Polyurethane and Ethylene-vinyl acetate below. Keep scrolling!
PU is on the higher end as far as cost goes. Typically Polyurethane is higher in cost compared to EVA, reflecting its durable and high performance nature. This work boot is definitely considered a long-term investment due to its extended lifespan and reliability.
EVA is lighter on the wallet when it comes to midsoles! Typically Ethylene-vinyl acetate is more budget-friendly than PU, offering a cost-effective option for those with budget constraints. EVA is a good choice for those seeking a balance between performance and affordability!
If you want to learn more, please visit our website Custom Safety Shoes.