{"product_id":"midweight-half-zip-base-layer-top-womens","title":"REI Co-op Midweight Half-Zip Base Layer Top - Women's","description":"\u003cp style=\"margin:1em 0\"\u003eThis soft, synthetic base layer top from REI Co-op provides midweight warmth for comfortable layering on cold days. It features thumbholes and a half-zip front for venting when you're working hard.\u003c\/p\u003e\u003cp style=\"margin:1em 0\"\u003eThe 92% recycled polyester\/8% spandex fabric is peached for a supersoft next-to-skin feel and has a smooth face so layers slide on easily. It wicks moisture, offers UPF 50+ sun protection, and includes underarm gussets for full range of movement.\u003c\/p\u003e\n\u003ch3 style=\"margin:1.25em 0 0.5em\"\u003eKey Features\u003c\/h3\u003e\n\u003ctable class=\"pu-table\" style=\"width:100%;border-collapse:separate;border-spacing:0;border:0;box-shadow:none;outline:none;background:none;table-layout:fixed;margin:0 0 1em\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eBest Use\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eMultisport\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eShirt Type\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003ePartial-zip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eFabric\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003e92% recycled polyester\/8% spandex (bluepass certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eSun-Protective Fabric\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eUPF Rating\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003e50+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eMoisture Wicking\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eUnderwear Weight\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eMidweight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eSleeve Length\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eLong Sleeve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eThumbholes\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eGender\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top;border-bottom:1px solid rgba(128,128,128,0.16);border-bottom:1px solid color-mix(in srgb,currentColor 12%,transparent)\"\u003eWomen's\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:0;padding:0.4em 0.75em 0.4em 0;opacity:0.65;vertical-align:top\"\u003eSustainability\u003c\/td\u003e\n\u003ctd style=\"border:0;padding:0.4em 0;vertical-align:top\"\u003eFair Trade Certified™ Factory - Contains recycled materials - Contains bluepass certified material - From a Climate Label Certified brand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3 style=\"margin:1.25em 0 0.5em\"\u003eHighlights\u003c\/h3\u003e\n\u003cul style=\"margin:1em 0\"\u003e\n\u003cli\u003eRecycled polyester\/spandex is peached for a supersoft next-to-skin layer—and has a smooth face so layers slide on easily\u003c\/li\u003e\n\u003cli\u003e220 g\/m² fabric weight offers midweight warmth and wicks moisture to keep you comfortable, with spandex adding just the right amount of stretch\u003c\/li\u003e\n\u003cli\u003eUPF 50+ sun protection\u003c\/li\u003e\n\u003cli\u003eHigh neck coverage with a half-zip front lets you open up for venting when you're working hard\u003c\/li\u003e\n\u003cli\u003eThumbholes hold sleeves in place and help seal warmth in\u003c\/li\u003e\n\u003cli\u003eUnderarm gussets allow full range of movement\u003c\/li\u003e\n\u003cli\u003eSemifitted to hug the body for optimum performance\u003c\/li\u003e\n\u003cli\u003eFlat seams reduce chafing\u003c\/li\u003e\n\u003cli\u003eLocker loop makes it easy to hang this to dry or just keep it off the ground\u003c\/li\u003e\n\u003cli\u003eMachine wash cold; wash separately; gentle cycle; remove promptly; do not use bleach or fabric softeners; tumble dry low; low iron; do not dry clean\u003c\/li\u003e\n\u003cli\u003eContains bluepass certified material\u003c\/li\u003e\n\u003cli\u003eMade in a Fair Trade Certified™ factory\u003c\/li\u003e\n\u003cli\u003eREI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin:1.25em 0 0.5em\"\u003eVideos\u003c\/h3\u003e\n\u003ctable class=\"pu-table\" style=\"width:100%;border-collapse:separate;border-spacing:0;border:0;box-shadow:none;outline:none;background:none;table-layout:fixed;margin:0 0 0.75em\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd style=\"border:0;padding:0\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/BCmhkhKDjYE\" title=\"Product video\" loading=\"lazy\" allow=\"accelerometer;autoplay;clipboard-write;encrypted-media;gyroscope;picture-in-picture\" allowfullscreen style=\"display:block;width:100%;max-width:560px;aspect-ratio:16\/9;border:0;border-radius:8px\"\u003e\u003c\/iframe\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp style=\"margin:1em 0\"\u003eBetter gear is built together. From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.\u003c\/p\u003e\n\u003ch4 style=\"font-size:1.05em;font-weight:600;margin:0.9em 0 0.2em\"\u003eWhich material is best?\u003c\/h4\u003e\u003cp style=\"margin:0 0 0.6em\"\u003eWool: highly moisture-wicking and odor-resistant. Synthetic: durable and less expensive. Silk: soft and lightweight for casual activities.\u003c\/p\u003e\u003ch4 style=\"font-size:1.05em;font-weight:600;margin:0.9em 0 0.2em\"\u003eMatch the temp to the trek\u003c\/h4\u003e\u003cp style=\"margin:0 0 0.6em\"\u003eLightweight layers: best for moderate to cool temperatures. Midweight layers: best for cold temperatures. Heavyweight layers: best for below-freezing temperatures.\u003c\/p\u003e\u003ch4 style=\"font-size:1.05em;font-weight:600;margin:0.9em 0 0.2em\"\u003eFind your fit\u003c\/h4\u003e\u003cp style=\"margin:0 0 0.6em\"\u003eMust be close to skin to efficiently wick sweat; should fit comfortably snug. Base layer is for moisture control; your mid layer is for warmth.\u003c\/p\u003e","brand":"REI Co-op","offers":[{"title":"Limestone Blue \/ 1X","offer_id":67860745912547,"sku":"C085900030","price":55.26,"currency_code":"USD","in_stock":true},{"title":"Limestone Blue \/ 2X","offer_id":67860745945315,"sku":"C085900031","price":55.26,"currency_code":"USD","in_stock":true},{"title":"Army Cot Green \/ 2X","offer_id":67860745978083,"sku":"C085900007","price":55.26,"currency_code":"USD","in_stock":true},{"title":"Limestone Blue \/ XL","offer_id":67860746010851,"sku":"C085900029","price":55.26,"currency_code":"USD","in_stock":true},{"title":"Army Cot Green \/ 3X","offer_id":67860746043619,"sku":"C085900008","price":55.26,"currency_code":"USD","in_stock":true},{"title":"Cloud White \/ XS","offer_id":67860746076387,"sku":"C085900009","price":55.26,"currency_code":"USD","in_stock":true},{"title":"Black \/ 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