• Terrain


    Shoes best for road, track and light gravel. See the best road shoes.


    Shoes best for trail, off road, mountains and other unstable surfaces. See the best trail shoes.

    Good to know

    As long as you stick to the road or path, and if you want just one running shoe, buy a road running shoe.

  • Arch support

    Neutral / cushion / high arch

    Shoes for runners who do not need any additional arch support (Around 50% of runners). Best for people with normal, high or medium high arches. See the best neutral shoes.

    Stability / overpronation / normal arch

    Shoes for runners who need mild to moderate arch support (Around 45% of runners). Best for runners with a low arch. See the best stability shoes.

    Motion control / severe overpronation / flat feet

    Shoes for runners who needs a lot of arch support. Best for runners with flat feet. See the best motion control shoes.

    Good to know

    - Rule of thumb: If in doubt, buy neutral shoes to avoid injuries.
    - More about arch support in this video.
    - Find your arch type by following steps from this video.

  • Use

    Daily running

    Cushioned shoes for your daily easy running. Great comfort. See best shoes for daily running.


    Lightweight shoes good for races, interval training, tempo runs and fartlek. Here are the best competition running shoes.

    Good to know

    If you want just one pair of shoes, buy a shoe for daily running.

  • Price
  • Weight
    Men: 10oz
    Women: 7oz
  • Heel to toe drop
    Men: 8mm
    Women: 8mm

    The height difference from the heel to the forefoot, also known as heel drop, toe spring, heel to toe spring or simply drop.

    There are many opinions about what a good heel drop is. We do not recommend any in particular. Lean more in this video.

  • Heel height
    Men: 23mm
    Women: 23mm
  • Forefoot height
    Men: 15mm
    Women: 15mm
  • Width
    Men: normal
    Women: normal
  • Release date
  • Special editions
Show more facts


Expert Reviews

Experts are runners, who post reviews at youtube, directly at RunRepeat or at their own websites. Each expert is categorized from level 1 to level 5 based on expertise. See stats on expert reviews and how we calculate scores here.

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  • First look / Unboxing | Shop Zappos

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Updates to Nike Free RN 2018 Sun

  • The Nike Free RN 2018 Sun is a running shoe that’s designed for the neutral pronator. It has a lightweight and flexible build that’s meant to accommodate the natural movement capacity and bending prowess of the human foot. Even its name suggests freedom to move and have control over the pavement.
  • A knitted material serves as the fabric of the upper unit. Its purpose is to stretch and acclimate itself to the dimensions of the foot, thus giving a customized and agreeable wrap. Nike’s proprietary Flywire cables connect to flat laces, permitting the façade to hug the foot properly in tandem with the tightening or loosening of the lacing system.
  • Underfoot cushioning is given by the Phylon midsole foam. It is a full-length unit that is exposed to the ground. Textured sections on the external part of this ground-contact material are responsible for surface grip.

Nike Free RN 2018 Sun size and fit

This special edition of the Free RN 2018  is true to size. It welcomes the usual expectations of consumers when it comes to length. The width profiles of this model are D – Medium for men and B – Medium for women. The semi-curved shape of this running shoe allows the natural curve of the human foot to acclimatize to the in-shoe experience.


The outsole unit of the Nike Free RN 2018 Sun makes use of a full-length foam that is wholly in contact with the ground. It has a textured surface to dole out traction over the asphalt.

The Tri-Star construction is a set of three-pointed holes that make the underfoot platform flexible. They also reduce the overall weight of the foam. Such a design permits the natural capability of the foot to bend as it goes through the gait cycle.

Sipes are patterned across the sections that are more inclined to flex. These tiny cuts are meant to heighten the sole unit’s ability to follow the motion of the foot.


Phylon is a proprietary compound that’s meant to provide responsive cushioning to the foot. It runs the entire length of the Nike Free RN 2018 Sun, ensuring full coverage. Its flexible design leads the runner towards a smooth heel-to-toe transition.

A foam insole is placed right above the primary cushioning platform. It adds a bit more support for the underfoot. It can be removed or replaced with a different insert.


A knitted fabric graces the upper unit of the Nike Free RN 2018 Sun. It is breathable and stretchy. It aims to provide a form-fitting coverage that’s also well-ventilated.

A soft fabric lining has the goal of hugging the foot and keeping it free of irritation. Its smooth nature also allows the runner to wear this shoe without putting on socks first.

A stretchy heel lock system is made up of a wraparound spandex cover on the heel collar. It’s designed to secure the back of the foot in place, preventing it from wobbling or exiting the foot-chamber unexpectedly.

Dynamic Flywire cables connect to the traditional lacing system via parallel eyelets. These wires jut out from between the exterior and interior layers of the upper unit, adjusting the fit in conjunction with the tightening or loosening of the shoelaces.

The padded collar and the stretchy tongue offer support to the instep and the heel, respectively. These parts of the shoe are also responsible for maintaining in-shoe steadiness.