FS4+ Compression Bracing Socks
FS4+ Compression Bracing Socks Blue FS4+ Package Image Pairs web Grey FS4+ Package Image Pairs web White FS4+ Package Image Pairs web FiveColors Pink FS4+ Package Image Pairs web Size Chart Reflective Zone Image Active Black 3 insta-os1st fs4+ 2 copy

FS4+ Compression Bracing Socks

5.00 out of 5 based on 5 customer ratings
(5 customer reviews )

The FS4+ Compression Bracing Socks is a new expansion of our Socks with PurposeTM program.  Designed as an all-in-one performance running and recovery sock, our FS4+ socks provide relief for ankle swelling, varicose veins, Plantar Fasciitis, Achilles tendonitis, heel and arch pain and shin splints while also improving recovery.  Our proprietary design infused with award winning, patented FS6® technology makes these socks a must-have to help strengthen your foot and leg structure and act as an overall health and performance aid. With precise targeted and medical grade graduated compression levels, the FS4+ features Compression Zone Technology® that is designed for proper foot and leg support and injury prevention. Developed with the highest quality, soft moisture-wicking fabric containing an anti-odor treatment and padding in the right places, the FS4+ creates a technical performance sock that strengthens the foot and leg structure and prevents overuse injuries. Targeted Conditions:

  • Recovery
  • Ankle Swelling
  • Varicose Veins
  • Plantar Fasciitis
  • Achilles Tendonitis
  • Heel/Arch Pain
  • Shin Splints

Performance Features:

  • Moisture wicking, extra durable and soft micro-fiber nylon
  • Extra cushioning without the bulk
  • Anatomical left/right design for the perfect fit
  • Medical Grade 20-30mmHg graduated compression

Comes with one (1) pair of socks per package.


Clear selection

FS4+ COMPRESSION BRACING SOCKS by OS1stwebsite 2 piece logo

Under Pressure? Give Your Best Performance with OS1st Socks with PurposeTM featuring the FS4+ Compression Bracing Socks.

When you get your blood pumping, all the muscles in your body need their share. Proper circulation is important for maintaining and rebuilding muscles after intense workouts. FS4+ Compression Bracing Socks will support your muscles while they work hard. Designed for running, walking, standing, sitting, gym, and even sleep in them. Every sock is engineered with the highest quality machines and materials to provide the best technical performance features, developed through years of exhaustive research, for increased comfort and performance. This lightly padded sock is a perfect match for the demanding athlete but also for the occasional runner seeking a perfect feeling of support.

The Best Recovery Socks for the Seasoned Athlete!

Our FS4+ Compression Bracing Socks provide medical grade orthopedic support combined with  Compression Zone Technology® to relieve pain and prevent injury.  Get relief from past injuries, Plantar Fasciitis, swollen ankles and feet, shin splints, or poor circulation.

Zone Image5 Zones of Medical Grade Graduated Compression

The OS1st® FS4+ Compression Bracing Socks are designed anatomically correct with a Y-gore heel pocket for perfect placement on your feet and legs.  The five zones of compression boost venous flow, protect the Plantar Fascia, support the Achilles and improve circulation to create a product that is comfortable and easy to wear daily.

Faster Recovery, Improved Circulation, and Injury Prevention!

Our compression bracing socks reduce and prevent pain and injury from active lifestyles. Wear the FS4+ socks for top-notch performance!

Available in a sporty black, grey, pink and white, with our exclusive reflective logo for safety in low light conditions, the OS1st® FS4+ Compression Bracing Socks are a perfect fit for your active lifestyle!

Additional information

Weight 1 oz
Dimensions 3.5 × 7 × 1 in

Black, Blue, Grey, Pink Fusion, White


Large, Medium, Small, X-Large

Sizing Chart

How do you know what size? Just use the following chart:


Customers' review

Rated 5.00 out of 5 stars
5 reviews
4 stars 0 0 %
3 stars 0 0 %
2 stars 0 0 %
1 star 0 0 %

5 reviews for FS4+ Compression Bracing Socks

  1. 5 out of 5

    ImpressedI have to say the FS4+ socks and the FS4 socks are my absolute favorite. I wear them both all the time. I usually never wear compression socks on a run, always after, but I just ran a 20 miler in the compression socks. I am so impressed with the comfort and compression of the socks. Truly top of the line quality and comfort!!!!

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  2. 5 out of 5

    I'm a believer!My fiancée and I met you at the New York City Marathon expo on Thursday night. You sold me two pairs of Plantar Fascitis socks, the FS4 No Show and the FS4+, and I wanted to let you know that they truly made a difference. The marathon was brutal for me this year, but I don't think I would have been able to get through it without the short socks. Additionally, I flew from NYC to Seattle for work that Monday morning and the compression socks were life savers. The support those socks provide is incredible. Thanks for sharing the insights and convincing me to make the purchase. I'm a believer!

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  3. 5 out of 5

    Breathable and good for recoveryJust received the FS4+. Very nice quality, fit and feel. The material is very breathable. That’s important for me when doing races in the heat. Good for recovery too.

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  4. 5 out of 5

    Soft & WorkedVery soft and they were perfect! I did not swell at all.

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  5. 5 out of 5

    Soft & amazing!My edema is very bad due to health issues. I need to wear compression socks all day. These are so soft. After I got them on, I did not know they were on. Love how soft they are!!!! My legs and feet did not swell at all.

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