OS1st FS4 & FS4+ Plantar Fasciitis Compression Socks – 4-Zone Graduated Compression for Heel & Arch Pain

The OS1st FS4 Compression Bracing Socks deliver targeted 4-zone graduated compression to the arch, ankle, Achilles, and calf — providing comprehensive relief for plantar fasciitis, arch pain, heel pain, Achilles tendinopathy, and ankle swelling. Unlike sleeve-only products, the FS4 is a full sock that provides comfort throughout the foot and calf while delivering therapeutic compression exactly where needed. The FS4+ (Over the Calf) extends compression up the full calf for enhanced circulation and swelling control.

• 4-zone graduated compression: arch, ankle, Achilles, calf
• Relieves plantar fasciitis, heel pain, and arch pain
• FS4 (ankle height) and FS4+ (over-the-calf) options
• Fits inside most shoes for all-day wear
• Available in Small, Medium, Large, X-Large, XX-Large

Frequently Asked Questions

What is the difference between the FS4 and FS4+?

The FS4 is an ankle-height compression sock with 4-zone targeted compression. The FS4+ is the over-the-calf version that extends the compression up the entire calf — providing additional support for ankle swelling, varicose veins, calf fatigue, and shin splints. Choose FS4 for focused foot/heel/arch support; choose FS4+ for full lower leg compression.

Can I wear the OS1st FS4 inside regular shoes?

Yes. The FS4 is designed to be thin enough to wear inside most athletic and everyday shoes without affecting fit. It replaces your regular sock during daily use or sport.

How do OS1st compression socks help plantar fasciitis?

The FS4's targeted arch compression supports the plantar fascia ligament, reducing tension and strain during walking and standing. The heel and Achilles zones provide cushioning and stability, reducing the micro-tears that cause plantar fasciitis pain. Many users find wearing them from first morning steps significantly reduces heel pain.

How do I choose the right size?

Size is based on shoe size. Check the OS1st sizing chart on the packaging. A correctly fitting compression sock should feel firm but comfortable — not restrictive or cutting into the skin.

Can I wash OS1st FS4 socks in the washing machine?

Yes — machine wash in cool or warm water on a gentle cycle. Do not tumble dry on high heat as this damages compression fibres. Air dry or tumble dry on low to preserve compression and elasticity.