{"product_id":"os1st-fs4-plantar-fasciitis-socks","title":"OS1st FS4 Plantar Fasciitis Socks","description":"\u003cp\u003e\u003cstrong\u003eIf heel and arch sensitivity make the first steps of the day rough, the FS4 Plantar Fasciitis Socks put the same six-zone compression idea behind OS1st's flagship sleeves directly into a regular sock you can wear all day.\u003c\/strong\u003e\u003c\/p\u003e\u003ch3\u003eBest Used For\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDaytime support for plantar fascia discomfort\u003c\/li\u003e\n\u003cli\u003eLong days standing, walking, or running on hard surfaces\u003c\/li\u003e\n\u003cli\u003eWearing inside work boots, athletic shoes, or everyday footwear\u003c\/li\u003e\n\u003cli\u003eAdding gentle structure to your day without a separate sleeve\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTargeted arch and heel compression inspired by the original FS6 sleeve\u003c\/li\u003e\n\u003cli\u003eDeep heel pocket and anatomical shaping that keeps the sock in place\u003c\/li\u003e\n\u003cli\u003eMoisture-wicking yarns engineered for extended daily wear\u003c\/li\u003e\n\u003cli\u003eSeamless construction to help limit rubbing on sensitive feet\u003c\/li\u003e\n\u003cli\u003eAvailable in No-Show, Quarter Crew, Crew, and Merino Wool lengths\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSize And Fit\u003c\/h3\u003e\u003cp\u003eThe FS4 Plantar Fasciitis Sock is sized S through XL and sold one pair per box. Sizing follows shoe size — match the chart below to your everyday footwear and pick the corresponding size.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSizes: S, M, L, XL\u003c\/li\u003e\n\u003cli\u003eAvailable in No-Show, Quarter Crew, Crew, and Merino Wool\u003c\/li\u003e\n\u003cli\u003eColours include Black, White, Grey, Aqua, Coral, Lavender, Mint, Blue, Steel Blue\u003c\/li\u003e\n\u003cli\u003eOne pair per box\u003c\/li\u003e\n\u003cli\u003eStandard: 89% Nylon, 11% LYCRA Spandex · Merino Wool: 40% Nylon, 25% Acrylic, 25% Merino Wool, 10% LYCRA Spandex\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0636\/9725\/6660\/files\/Fs4-Size-Chart.webp?v=1778786247\" alt=\"OS1st FS4 Plantar Fasciitis Socks Size Chart\" loading=\"lazy\" width=\"900\" style=\"max-width: 100%; height: auto;\"\u003e\u003c\/p\u003e\u003ch3\u003eCare Instructions\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMachine wash cold on gentle cycle\u003c\/li\u003e\n\u003cli\u003eTumble dry on low heat\u003c\/li\u003e\n\u003cli\u003eNo bleach\u003c\/li\u003e\n\u003cli\u003eNo fabric softener\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping And Returns\u003c\/h3\u003e\u003cp\u003eShipped from Medibrace Canada with Canadian checkout and bilingual customer support. Compression and bracing products are fit-sensitive, so we recommend reviewing the size chart before ordering for the best feel.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eHow does this compare to the FS6 sleeve?\u003c\/strong\u003e The FS6 is a footwear-only sleeve worn under socks. The FS4 builds the compression zones directly into a wearable sock — convenient when you want one layer instead of two.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich length should I pick?\u003c\/strong\u003e No-Show disappears in running shoes, Quarter Crew sits above the ankle, Crew is a classic mid-calf height, and Merino Wool is the cool-weather pick.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I wear them inside work boots?\u003c\/strong\u003e Yes. The Crew or Merino Wool versions in particular work well as a daily work-boot sock with built-in arch support.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre they sold as a pair?\u003c\/strong\u003e Yes, one pair per box.\u003c\/p\u003e","brand":"OS1st","offers":[{"title":"S","offer_id":47940538040532,"sku":null,"price":47.99,"currency_code":"CAD","in_stock":false},{"title":"M","offer_id":47940538073300,"sku":null,"price":47.99,"currency_code":"CAD","in_stock":false},{"title":"L","offer_id":47940538106068,"sku":null,"price":47.99,"currency_code":"CAD","in_stock":false},{"title":"XL","offer_id":47940538138836,"sku":null,"price":47.99,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0636\/9725\/6660\/files\/OS1st_Plantar-Fasciitis-Performance-Socks_noshow_black_1.webp?v=1778786234","url":"https:\/\/medibrace.ca\/products\/os1st-fs4-plantar-fasciitis-socks","provider":"Medibrace Canada","version":"1.0","type":"link"}