Performance · Recovery · Support

The OS1st FS4+ is a medical-grade compression sock (20–30 mmHg) designed to support your feet and legs during activity and speed up recovery afterward. Made with extra-durable, moisture-wicking micro-nylon, it helps relieve swelling, plantar fasciitis, Achilles tendonitis, varicose veins, heel & arch pain, and shin splints.

Features:

• Graduated compression (20–30 mmHg) for circulation & recovery

• Relieves foot, ankle & leg pain from sports or daily wear

• Seamless, left/right design with Y-Gore heel to prevent slipping

• Silver-ion treated fabric for odour control

• Extra cushioning without bulk

• Appropriate for varicose veins, moderate venous issues.

• If you have severe venous disease, a history of DVT, or other circulatory disorders, consult a doctor before use.

How to Wear Your OS1st FS4+ Compression Socks

The OS1st FS4+ socks are designed to feel firm and snug—that’s how they deliver effective, medical-grade compression (20–30 mmHg).

To put them on more easily:

• Turn the sock inside out down to the heel.

• Slide your foot in, then gently roll the sock up over your calf.

• Smooth out any wrinkles as you go.

• A sock aid or a thin plastic bag over your foot can make sliding easier.

Make sure the sock fits snugly around your ankle—this is where compression is strongest for improving circulation.

A few things to remember:

• It’s normal for the socks to feel tight at first.

• That firm fit is what supports your legs, boosts blood flow, and helps reduce swelling.

• Always measure your legs and refer to the size chart. A sock that’s too tight or too loose won’t work as well.

Available Sizes:

• Medium

• Large

Other Sizes (by request):

• Small

• X-Large

Material: 80% Nylon, 20% Lycra Spandex Care: Hand wash, air dry (no bleach or softener) Includes: 1 Pair

We accept returns of this product within 14 days. Please ensure products are unopened, unused and in their original packaging.