{"product":{"catalog_id":"e33f032f-3aca-48c9-a9ae-25241001a19e","item_id":"b253c54c458d12566a00a8676717e9d5d6bc57df8cb60665a1a2c492044492d8","title":"250 Merino Wool Thermal Top","description":"The 250 Merino Wool Thermal Top is a long-sleeve crew-neck base layer made from fine pure merino wool in a 250 g knit, designed to manage moisture and provide thermal insulation in cold and extreme conditions. It features a slim ergonomic cut with flatlock seams for mobility, a narrow ribbed collar, simple cuffs, a small logo on the upper sleeve, and a woven tag at the wrist. 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Enough to Buy in Every Color","rating":5,"content":"An absolute must for your winter closet! It has a surprisingly nice thickness that makes it feel really high quality & super comfy. The person I gifted it to loved it so much, I ended up getting it in multiple colors. Definitely a great buy!","reviewer_name":"Ra A."},{"date":"February 14, 2026","title":"Il tombe très bien. La","rating":5,"content":"Il tombe très bien. La grandeur est juste","reviewer_name":"Enrico T."},{"date":"November 24, 2025","title":"Peut être un peu grand","rating":5,"content":"Peut être un peu grand","reviewer_name":"Marguerite D."},{"date":"September 24, 2025","title":"Haut thermique Smartwool pour homme","rating":5,"content":"Très apprécié.","reviewer_name":"Céline B."},{"date":"February 19, 2025","tags":["Fabric","Comfort"],"title":"Un cadeau à offir","rating":5,"content":"Je viens de recevoir le haut thermique. . . il est doux et semble très comfortable. Je vais l'offrir en cadeau. . . donc j'ose espérer que notre beau-fils sera heureux et bien au chaud !","reviewer_name":"Louise L."},{"date":"January 30, 2025","title":"great for husband","rating":5,"content":"bought this for husband who works in the mining fields in northern alberta in -46C weather. he loves it","reviewer_name":"codey k."},{"date":"December 7, 2024","tags":["Fabric","Quality"],"title":"Une piece a avoir dans da garderobe","rating":5,"content":"Un tissu fin choisi soigneusement pour une qualite superieure tres beau produit.","reviewer_name":"Camelia M."},{"date":"December 6, 2024","tags":["Fabric","Durability"],"title":"confortable et chaud","rating":5,"content":"Le tissu est doux, j'ai hâte de voir après lavages\nBonne grandeur en ce qui me concerne 5'10\"/139 lbs","reviewer_name":"François L."},{"date":"November 7, 2024","tags":["Fabric","Quality"],"title":"Idéal pour l’hiver","rating":5,"content":"Beau, doux, de qualité, avec la laine merinos impossible de se tromper","reviewer_name":"Gilles B."},{"date":"December 1, 2023","title":"2e achat de ce chandail","rating":5,"content":"2e achat de ce chandail qui a été super apprécié\nPour un homme super sportif","reviewer_name":"Sylvie C."}],"target_countries":"US","canonical_url":"https://www.simons.ca/en/men-sports-clothes/outdoor/250-merino-wool-thermal-top--6683-230056","product_insights":[{"title":"Verified claims","type":"key_value","items":[{"value":"100% merino wool in a 250 g/m² interlock knit","key":"material","provenance":{"productData":true,"reviews":false,"qna":false,"urls":["https://www.smartwool.com/en-us/products/mens-classic-thermal-merino-base-layer-crew-sw016349","https://www.smartwool.com/en-ca/collections/classic-thermal-collection"]}},{"value":"Cold-weather thermal layer rated for cool 25–50° and cold below 25°","key":"warmth","provenance":{"productData":true,"reviews":false,"qna":false,"urls":["https://www.smartwool.com/en-us/products/mens-classic-thermal-merino-base-layer-crew-sw016349","https://www.smartwool.com/en-ca/collections/classic-thermal-collection","https://www.outdoorgearlab.com/reviews/clothing-mens/base-layer-men/smartwool-merino-250-crew","https://thetestedhub.com/reviews/smartwool-merino-250-base-layer/"]}},{"value":"Buyer report: used for mining work at -46°C and loved","key":"cold-weather use","provenance":{"productData":false,"reviews":true,"qna":false,"urls":[]}},{"value":"Slim next-to-skin cut, but often described as generous; 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Smartwool describes the thicker 250 merino fabric as offering thermal resistance intended for extreme conditions while helping keep you warm and dry. One reviewer reported it kept them warm when needed with a soft next-to-skin feel, and a customer using it for work in extreme cold reportedly found the warmth sufficient.","sourceIds":["source:lqv101lr7j5c","source:1c73mva18uipdo","source:10kcxkqn7uwmq","source:qtsin7rgsqql"],"claimAddress":"insights.use_cases.3071c253b279e31665c4"},{"id":"use-case:deep-research-retained-use-cases-use-2-base-layer-for-cold-weather-activity-where-you-work-up-a-sweat","label":"Base layer for cold-weather activity where you work up a sweat","recommendation":"Smartwool bills this 250 Merino Wool Thermal Top as a base layer for cold-weather activities where warmth and breathability matter. The brand says its 100% Merino wool construction moves sweat away from the skin while still in vapor form, helping you stay warm, dry, and odor-free through a full day out. It is also described as thicker and softer, with thermal resistance suited to extreme conditions.","sourceIds":["source:lqv101lr7j5c","source:1c73mva18uipdo","source:qtsin7rgsqql"],"claimAddress":"insights.use_cases.0376e00b5e275412aee6"},{"id":"use-case:deep-research-retained-use-cases-use-3-staying-fresh-through-long-days-of-cold-weather-activity","label":"Staying fresh through long days of cold-weather activity","recommendation":"A base layer for cold-weather activities where sweat and odor can build up, like days of continuous outdoor wear. Smartwool states its 100% Merino wool construction is for natural odor-resistance and says the fabric's moisture movement helps keep you warm, dry, and stink-free all day long.","sourceIds":["source:1c73mva18uipdo","source:qtsin7rgsqql"],"claimAddress":"insights.use_cases.895db88976e9860912b1"},{"id":"use-case:deep-research-retained-use-cases-use-4-comfortable-everyday-winter-layering","label":"Comfortable everyday winter layering","recommendation":"Reviewers using this thermal top for everyday winter layering describe the thick, soft merino fabric as feeling high quality and comfortable for daily wear. Based on customer reviews, this is a reported experience rather than a guaranteed result.","sourceIds":["source:lqv101lr7j5c"],"claimAddress":"insights.use_cases.9ec22c23c526118ffc64"},{"id":"use-case:deep-research-retained-use-cases-use-5-a-warm-mobile-base-layer-for-hiking-days","label":"A warm, mobile base layer for hiking days","recommendation":"One reviewer who hiked in the Thermal Crew Base Layer reports it kept them warm when needed and had a next-to-skin feel they looked forward to after a long day on trail. They also say the raglan sleeves left enough space that they didn't feel restricted, allowing plenty of mobility at camp and on the trail, matching Smartwool's ergonomic cut with flat seams designed for a broad range of motion.","sourceIds":["source:10kcxkqn7uwmq","source:lqv101lr7j5c"],"claimAddress":"insights.use_cases.6e726fcbe0bec76ca805"},{"id":"use-case:deep-research-retained-use-cases-use-6-a-gift-for-active-men","label":"A gift for active men","recommendation":"This merino thermal top is bought as a gift for active or sporty men. 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