Not enough just for home. Last summer's viral LumiStep evolves into outdoor footwear.
Radiantne Co., Ltd. has launched "LumiStep III" recovery sandals, the first outdoor type in the LumiStep series, which became a big hit on social media last summer. Responding to women's needs to be comfortable not only at home but also outdoors, it supports the feet with a 3D arch support structure inspired by high-performance insoles.
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- 📰 Published: May 12, 2026 at 20:10
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Radiantne Co., Ltd., which develops innerwear and beauty goods for women, is launching "LumiStep III," the first outdoor recovery sandal in the LumiStep series, which became a big hit on social media last summer and recorded over 15,000 pairs sold monthly*. This is the third installment in the LumiStep series, born from women's true feelings: "I want to wear comfortable shoes, but I don't want my feet to look sloppy." Last summer, this "beauty and health just by wearing" series, which became a huge topic on social media, has finally left the house and evolved into recovery sandals suitable for outdoor walking. LumiStep III adopts a 3D arch support structure, inspired by high-performance insoles, for the sandal's footbed. While cushioning impact, it provides a stable feeling without sinking too much, comfortably supporting every step of your day. Available in two colors, black and ivory, it's a pair that naturally blends into cafe hopping, shopping, travel, and even short errands.
◆ Not enough just for home. Until LumiStep went outside.
The LumiStep series was born from the desire to deliver a "new habit of beauty and health just by wearing" to the feet of women leading busy daily lives.
The first LumiStep appeared as diet slippers that stimulate the soles of the feet just by wearing them at home, transforming daily movements into a beauty habit. It sold over 15,000 pairs* per month and received a great response on social media.
The subsequent LumiStep II was developed as indoor recovery sandals featuring a soft, fluffy texture like a paw pad. It evolved into a pair that gently cradles tired feet from housework and standing work during time spent at home.
First-generation LumiStep Diet Slippers, LumiStep II Paw Pad Sandals
However, what became clear as the series developed was that,
"Feet are not only working hard inside the house."
Work, shopping, picking up children, travel, cafe hopping.
Women's feet are constantly working outside too.
Stylish shoes are tiring.
But comfortable sandals often look sloppy.
Recovery sandals are appealing, but they are too sporty to match everyday clothes.
We don't want to take such "foot endurance" for granted.
That's why LumiStep III, an outdoor arch recovery sandal, the third installment in the LumiStep series, was born.
LumiStep III Arch Recovery Sandals
The most challenging part of the development process was integrating the "supporting power" of insoles with the "enveloping softness" of recovery sandals into a single form.
After repeated prototyping, we arrived at an exquisite balance that provides a soft, enveloping sensation the moment you put them on, while firmly supporting the arch of the foot.
Our goal was not just comfortable sandals.
It's a pair that supports the soles of your feet with every step, transforming outdoor walking time into time for self-care.
"Where shall I walk today?"
We want to deliver footwear that makes every day a little more positive, with such thoughts in mind for LumiStep III.
◆ Stylish endurance or sloppy comfort. For feet with only these two options.
Isn't daily walking time unconsciously taken for granted?
When you wear comfortable sandals, you tend to shuffle.
Shoes chosen with thoughts like "It's just nearby" or "As long as they're easy to move in" can end up looking sloppy.
Commuting shoes and stylish outing sandals can make your feet tired after long walks.
Recovery sandals are appealing, but they are too sporty to match your clothes.
In reality, I just want to be comfortable.
I want to put them on and go out without thinking.
But I don't want my feet to look sloppy.
I also don't want my walking to look untidy.
I want functionality, but I also want a neat appearance.
LumiStep III addresses these contradictory feelings.
Stylish endurance or sloppy comfort.
In a world with only these two options, we may have unconsciously given up.
"Walking time" occupies a long part of the day.
What if that time could be transformed into time for self-care?
LumiStep III was born from this idea.
◆ Firmly adjust. Softly release. Gracefully walk out.
No special time or strenuous effort is needed.
LumiStep III is a new sensation arch recovery sandal that, just by wearing it, its "high-performance insole" adjusts the sole of your foot and transforms outdoor walking into recovery time.
Despite being sandals, they adopt a 3D arch support structure that fits like filling the gaps in the sole of your foot. While firmly supporting the arch, they comfortably support your feet with every step.
Not just soft, but also firm.
◆ Not enough just for home. Until LumiStep went outside.
The LumiStep series was born from the desire to deliver a "new habit of beauty and health just by wearing" to the feet of women leading busy daily lives.
The first LumiStep appeared as diet slippers that stimulate the soles of the feet just by wearing them at home, transforming daily movements into a beauty habit. It sold over 15,000 pairs* per month and received a great response on social media.
The subsequent LumiStep II was developed as indoor recovery sandals featuring a soft, fluffy texture like a paw pad. It evolved into a pair that gently cradles tired feet from housework and standing work during time spent at home.
First-generation LumiStep Diet Slippers, LumiStep II Paw Pad Sandals
However, what became clear as the series developed was that,
"Feet are not only working hard inside the house."
Work, shopping, picking up children, travel, cafe hopping.
Women's feet are constantly working outside too.
Stylish shoes are tiring.
But comfortable sandals often look sloppy.
Recovery sandals are appealing, but they are too sporty to match everyday clothes.
We don't want to take such "foot endurance" for granted.
That's why LumiStep III, an outdoor arch recovery sandal, the third installment in the LumiStep series, was born.
LumiStep III Arch Recovery Sandals
The most challenging part of the development process was integrating the "supporting power" of insoles with the "enveloping softness" of recovery sandals into a single form.
After repeated prototyping, we arrived at an exquisite balance that provides a soft, enveloping sensation the moment you put them on, while firmly supporting the arch of the foot.
Our goal was not just comfortable sandals.
It's a pair that supports the soles of your feet with every step, transforming outdoor walking time into time for self-care.
"Where shall I walk today?"
We want to deliver footwear that makes every day a little more positive, with such thoughts in mind for LumiStep III.
◆ Stylish endurance or sloppy comfort. For feet with only these two options.
Isn't daily walking time unconsciously taken for granted?
When you wear comfortable sandals, you tend to shuffle.
Shoes chosen with thoughts like "It's just nearby" or "As long as they're easy to move in" can end up looking sloppy.
Commuting shoes and stylish outing sandals can make your feet tired after long walks.
Recovery sandals are appealing, but they are too sporty to match your clothes.
In reality, I just want to be comfortable.
I want to put them on and go out without thinking.
But I don't want my feet to look sloppy.
I also don't want my walking to look untidy.
I want functionality, but I also want a neat appearance.
LumiStep III addresses these contradictory feelings.
Stylish endurance or sloppy comfort.
In a world with only these two options, we may have unconsciously given up.
"Walking time" occupies a long part of the day.
What if that time could be transformed into time for self-care?
LumiStep III was born from this idea.
◆ Firmly adjust. Softly release. Gracefully walk out.
No special time or strenuous effort is needed.
LumiStep III is a new sensation arch recovery sandal that, just by wearing it, its "high-performance insole" adjusts the sole of your foot and transforms outdoor walking into recovery time.
Despite being sandals, they adopt a 3D arch support structure that fits like filling the gaps in the sole of your foot. While firmly supporting the arch, they comfortably support your feet with every step.
Not just soft, but also firm.