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With its minimal drop, flexible build, and sleek design, the Primus Lite Knit helps you reconnect with how your body was meant to move.\u003c\/p\u003e\n\u003cp data-start=\"788\" data-end=\"802\"\u003e\u003cstrong data-start=\"788\" data-end=\"800\"\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"803\" data-end=\"1455\"\u003e\n\u003cli data-start=\"803\" data-end=\"918\"\u003e\n\u003cp data-start=\"805\" data-end=\"918\"\u003e\u003cstrong data-start=\"805\" data-end=\"821\"\u003eShoe Weight:\u003c\/strong\u003e Men’s size EU 42 approximately 246 g (8.7 oz); Women’s size EU 38 approximately 207 g (7.3 oz)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"919\" data-end=\"991\"\u003e\n\u003cp data-start=\"921\" data-end=\"991\"\u003e\u003cstrong data-start=\"921\" data-end=\"938\"\u003eMidsole Drop:\u003c\/strong\u003e Zero-drop design for natural posture and alignment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"992\" data-end=\"1072\"\u003e\n\u003cp data-start=\"994\" data-end=\"1072\"\u003e\u003cstrong data-start=\"994\" data-end=\"1011\"\u003eStack Height:\u003c\/strong\u003e Approximately 4 mm outsole for ground feel and flexibility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1073\" data-end=\"1150\"\u003e\n\u003cp data-start=\"1075\" data-end=\"1150\"\u003e\u003cstrong data-start=\"1075\" data-end=\"1094\"\u003eUpper Material:\u003c\/strong\u003e Breathable knitted upper made from recycled materials\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1151\" data-end=\"1238\"\u003e\n\u003cp data-start=\"1153\" data-end=\"1238\"\u003e\u003cstrong data-start=\"1153\" data-end=\"1165\"\u003eOutsole:\u003c\/strong\u003e Thin, durable, puncture-resistant rubber designed for natural movement\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1239\" data-end=\"1351\"\u003e\n\u003cp data-start=\"1241\" data-end=\"1351\"\u003e\u003cstrong data-start=\"1241\" 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available at Grivet Outdoors. Designed for lightweight versatility, this barefoot trainer features a breathable knitted upper for adaptive fit and comfort, while the ultra-thin sole promotes natural foot movement and sensory connection. Perfect for workouts, daily wear, or simply strengthening your feet, it’s crafted with sustainable materials that reduce environmental impact without sacrificing durability. With its minimal drop, flexible build, and sleek design, the Primus Lite Knit helps you reconnect with how your body was meant to move.\u003c\/p\u003e\n\u003cp data-start=\"788\" data-end=\"802\"\u003e\u003cstrong data-start=\"788\" data-end=\"800\"\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"803\" data-end=\"1455\"\u003e\n\u003cli data-start=\"803\" data-end=\"918\"\u003e\n\u003cp data-start=\"805\" data-end=\"918\"\u003e\u003cstrong data-start=\"805\" data-end=\"821\"\u003eShoe Weight:\u003c\/strong\u003e Men’s size EU 42 approximately 246 g (8.7 oz); Women’s size EU 38 approximately 207 g (7.3 oz)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"919\" data-end=\"991\"\u003e\n\u003cp data-start=\"921\" data-end=\"991\"\u003e\u003cstrong data-start=\"921\" data-end=\"938\"\u003eMidsole Drop:\u003c\/strong\u003e Zero-drop design for natural posture and alignment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"992\" data-end=\"1072\"\u003e\n\u003cp data-start=\"994\" data-end=\"1072\"\u003e\u003cstrong data-start=\"994\" data-end=\"1011\"\u003eStack Height:\u003c\/strong\u003e Approximately 4 mm outsole for ground feel and flexibility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1073\" data-end=\"1150\"\u003e\n\u003cp data-start=\"1075\" data-end=\"1150\"\u003e\u003cstrong data-start=\"1075\" data-end=\"1094\"\u003eUpper Material:\u003c\/strong\u003e Breathable knitted upper made from recycled materials\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1151\" data-end=\"1238\"\u003e\n\u003cp data-start=\"1153\" data-end=\"1238\"\u003e\u003cstrong data-start=\"1153\" data-end=\"1165\"\u003eOutsole:\u003c\/strong\u003e Thin, durable, puncture-resistant rubber designed for natural movement\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1239\" data-end=\"1351\"\u003e\n\u003cp data-start=\"1241\" data-end=\"1351\"\u003e\u003cstrong data-start=\"1241\" data-end=\"1260\"\u003eSustainability:\u003c\/strong\u003e Constructed with vegan, recycled, and bio-based materials to reduce environmental impact\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1352\" data-end=\"1455\"\u003e\n\u003cp data-start=\"1354\" data-end=\"1455\"\u003e\u003cstrong data-start=\"1354\" data-end=\"1376\"\u003eFoot Health Focus:\u003c\/strong\u003e Wide toe box and flexible build encourage natural foot strength and mobility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cul\u003e\n\u003c\/ul\u003e"}

Vivobarefoot Men's Primus Lite Knit Trainer

$130.85
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Vivobarefoot

Vivobarefoot Men's Primus Lite Knit Trainer

$130.85

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More from Vivobarefoot

Train, move, and live with natural freedom in the Vivobarefoot Primus Lite Knit, now available at Grivet Outdoors. Designed for lightweight versatility, this barefoot trainer features a breathable knitted upper for adaptive fit and comfort, while the ultra-thin sole promotes natural foot movement and sensory connection. Perfect for workouts, daily wear, or simply strengthening your feet, it’s crafted with sustainable materials that reduce environmental impact without sacrificing durability. With its minimal drop, flexible build, and sleek design, the Primus Lite Knit helps you reconnect with how your body was meant to move.

Features

  • Shoe Weight: Men’s size EU 42 approximately 246 g (8.7 oz); Women’s size EU 38 approximately 207 g (7.3 oz)

  • Midsole Drop: Zero-drop design for natural posture and alignment

  • Stack Height: Approximately 4 mm outsole for ground feel and flexibility

  • Upper Material: Breathable knitted upper made from recycled materials

  • Outsole: Thin, durable, puncture-resistant rubber designed for natural movement

  • Sustainability: Constructed with vegan, recycled, and bio-based materials to reduce environmental impact

  • Foot Health Focus: Wide toe box and flexible build encourage natural foot strength and mobility

How To Measure Your Shoe Size

Here are the best shoe size conversion charts - in US, UK, European, and inches, for men's, kid's and women's shoes. 
 
If you've ever wondered "What size shoe is a 38?" (It is a men's size 7.5 in the US) or "What is a size 40 in shoes?" (that'd be a US men's size 9.5), read on to learn how to measure shoe sizes in different countries.
 
How do you measure shoe size? It is possible to measure your own foot using a ruler or a Brannock device, but since our feet our three dimensional, this will only approximate your measurements. After you've measured your foot, try using our conversion charts below to see what your size is. Be mindful that different brands, like Altra running shoes vs. Brooks running shoes vs. Oboz hiking boots, maybe run slightly different in sizes. 
 

Women's Shoe Size Conversions
US Sizes Euro Sizes UK Sizes Inches CM
4 35 2 8.1875" 20.8
4.5 35 2.5 8.375" 21.3
5 35-36 3 8.5" 21.6
5.5 36 3.5 8.75" 22.2
6 36-37 4 8.875" 22.5
6.5 37 4.5 9.0625" 23
7 37-38 5 9.25" 23.5
7.5 38 5.5 9.375" 23.8
8 38-39 6 9.5" 24.1
8.5 39 6.5 9.6875" 24.6
9 39-40 7 9.875" 25.1
9.5 40 7.5 10" 25.4
10 40-41 8 10.1875" 25.9
10.5 41 8.5 10.3125" 26.2
11 41-42 9 10.5" 26.7
11.5 42 9.5 10.6875" 27.1
12 42-43 10 10.875" 27.6

Men's Shoe Size Conversions

US Sizes Euro Sizes UK Sizes Inches CM
6 39 5.5 9.25" 23.5
6.5 39 6 9.5" 24.1
7 40 6.5 9.625" 24.4
7.5 40-41 7 9.75" 24.8
8 41 7.5 9.9375" 25.4
8.5 41-42 8 10.125" 25.7
9 42 8.5 10.25" 26
9.5 42-43 9 10.4375" 26.7
10 43 9.5 10.5625" 27
10.5 43-44 10 10.75" 27.3
11 44 10.5 10.9375" 27.9
11.5 44-45 11 11.125" 28.3
12 45 11.5 11.25" 28.6
13 46 12.5 11.5625" 29.4
14 47 13.5 11.875" 30.2
15 48 14.5 12.1875" 31
16 49 15.5 12.5" 31.8
Big Kid Shoe Size Conversions (7 – 12 years)
US Sizes Euro Sizes UK Sizes Inches CM
3.5 35 2.5 8.625" 21.9
4 36 3 8.75" 22.2
4.5 36 3.5 9" 22.9
5 37 4 9.125" 23.2
5.5 37 4.5 9.25" 23.5
6 38 5 9.5" 24.1
6.5 38 5.5 9.625" 24.4
7 39 6 9.75" 24.8
Little Kid Shoe Size Conversions (4 – 7 years)
US Sizes Euro Sizes UK Sizes Inches CM
10.5 27 9.5 6.625" 16.8
11 28 10 6.75" 17.1
11.5 29 10.5 7" 17.8
12 30 11 7.125" 18.1
12.5 30 11.5 7.25" 18.4
13 31 12 7.5" 19.1
13.5 31 12.5 7.625" 19.4
1 32 13 7.75" 19.7
1.5 33 14 8" 20.3
2 33 1 8.125" 20.6
2.5 34 1.5 8.25" 21
3 34 2 8.5" 21.6

FAQ & Tips

  • What if I am between shoe sizes? We recommend you should size up, especially in active & sports shoes. This includes running shoes and hiking boots. 
  • Does 0.5 size make a difference in shoes? Yes, it certainly does! Wearing shoes that are too small can cause pain and injuries. Blisters, loss of toenails and bunions can all result from wearing shoes that are even 0.5 size too small. These are common ailments of beginner runners. 
  • Is one foot bigger than the other? It is common for people to have one foot that is slightly bigger than the other. Our tip is that you should buy shoes that fit the larger foot (buy pairs of shoes in the larger size of the two). 
  • Should shoes be tight or loose? Unfortunately, this is not a simple question. Shoes should not be too tight or too loose. You should be able to put a thumbs width at the end of your toe box, between your big toe and the pointy end of the shoe. You should also be able to snuggly fit your index finger between your heel and the back of the shoe. If you have not much (or not enough!) space in either of these areas, try a different size shoe. 
  • When should I try on shoes? A great tip for runners is to try on running shoes at the end of a work day. As you run, just like when you are on your feet for work, your feet swell. You will want to try on running shoes when your feet are at their largest. This allows them to still fit comfortably after a long distance run. 
  • What size shoe should I buy? This shoe chart is not a guarantee your shoes will fit. If you are in the area of Memphis, Tennessee, run on in to one of our running specialty & gear stores and our experienced fit experts will help you out!

Image below: A Brannock device is one tool run specialists use to measure shoe size. It can measure not only foot length, but also foot width. 

How to measure shoe size - Brannock Device

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