{"product_id":"oneill-womens-thermo-x-long-sleeve-insulative-top-warm-layering","title":"O'Neill Women's Thermo X Long Sleeve Insulative Top - Warm Layering","description":"\u003cp\u003eIn this review the O'Neill Women's Thermo X Long Sleeve Insulative Top earns its place as a go-to base layer for chilly water sports and cold-weather surf sessions. Designed primarily for women who need extra warmth under a wetsuit or for active aquatic classes, the top's main strength is the Thermo-X fabric that delivers noticeable insulation with very low bulk. The garment is also \u003cstrong\u003eUPF 50+ rated\u003c\/strong\u003e and Skin Cancer Foundation recommended, so it protects from sun as well as helping retain heat when the air and water are brisk.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermo-X insulation:\u003c\/strong\u003e Provides strong warmth with low bulk so it layers comfortably beneath a wetsuit without feeling bulky.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick-dry fabric:\u003c\/strong\u003e The nylon\/spandex blend dries fast after activity, reducing chill between sessions and making it practical for frequent use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPF 50+ protection:\u003c\/strong\u003e Offers high ultraviolet protection so wearers get sun defense during long days paddling or snorkeling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater repellency and odor resistance:\u003c\/strong\u003e Material sheds water and resists odors, which helps the top stay fresh over repeated wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper low neck:\u003c\/strong\u003e The low neck sits below wetsuit collars so it does not interfere with the neck seal of an overlying wetsuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft, comfortable fit:\u003c\/strong\u003e The fabric feels soft against skin and moves with the body for swimming and active use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe top is best for women who need an insulating base layer for surfing, diving, snorkeling or winter water aerobics where extra warmth and sun protection matter. Versatile for those who transition between water and shore, it works well for cold-water training like open-water swims or obstacle races that involve long exposure to chilly conditions.\u003c\/p\u003e\n\u003cp\u003eThose who prefer very loose layers or need a top that doubles as an outer garment on land may want to look elsewhere, since the design is optimized to be slim and worn under a wetsuit rather than as a standalone winter shirt. Also, shoppers sensitive to fit should note some customers report variance in sizing.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWarm and insulating without heavy bulk, ideal for layering under wetsuits.\u003c\/li\u003e\n\u003cli\u003eDries quickly and resists odor, making it low maintenance between sessions.\u003c\/li\u003e\n\u003cli\u003eProvides UPF 50+ sun protection and is Skin Cancer Foundation recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSizing can run inconsistent for some wearers, so try sizing guidance before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eO'Neill Wetsuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e220g nylon\/spandex blend\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKey fabric traits\u003c\/td\u003e\n\u003ctd\u003eThermo-X insulation, quick-dry, water repellency, odor resistance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSun protection\u003c\/td\u003e\n\u003ctd\u003eUPF 50+ (Skin Cancer Foundation Recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNeck style\u003c\/td\u003e\n\u003ctd\u003eSuper low neck to avoid wetsuit collar interference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended use\u003c\/td\u003e\n\u003ctd\u003eLayering under wetsuits, snorkeling, cold water activities\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe O'Neill Thermo X long sleeve insulative top is a smart purchase for active women who need dependable warmth and sun protection without added bulk. It pairs well under wetsuits for surfing, diving, or cold-water training sessions and offers good value given the quick-dry, water-repellent fabric and UPF 50+ rating. Just be mindful of fit when selecting size.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this top warm enough under a wetsuit?\u003c\/strong\u003e\u003cbr\u003eYes, the Thermo-X fabric provides insulation with low bulk specifically to add warmth beneath a wetsuit without compromising fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it offer sun protection?\u003c\/strong\u003e\u003cbr\u003eYes, the fabric is UPF 50+ and is a Skin Cancer Foundation recommended product for ultraviolet protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the material handle moisture?\u003c\/strong\u003e\u003cbr\u003eThe 220g nylon\/spandex blend has water repellency and quick-dry properties and also resists odor for repeated use.\u003c\/p\u003e","brand":"O'Neill Wetsuits","offers":[{"title":"Default Title","offer_id":48681713107163,"sku":"B06XG927JL","price":71.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61kp9nVZaPL._AC_SL1289_ffc5dbe4-6512-4d0a-86bf-6c03edb5eb14.jpg?v=1778672999","url":"https:\/\/gearmusthave.com\/products\/oneill-womens-thermo-x-long-sleeve-insulative-top-warm-layering","provider":"GearMustHave","version":"1.0","type":"link"}