Free U.S. shipping on every order · Free 30-day returns

Sigma Cum Laude

Sigma Cum Laude Heated Thermal Underwear with 22 Heating Zones, USB

SKU: CJYD187348602BY
$137.70 $460.70 Save 70%

In stock — ready to ship

Style
Size
  • Free U.S. shippingEvery order ships free.
  • Secure checkoutEncrypted payment processing.
  • 30-day free returnsPrepaid return label on eligible returns.
  • Email supportReplies within 1 business day.
Description

A base layer that heats itself

This thermal underwear has heating zones woven into the fabric: 12 in the top, 10 in the long johns, 22 in the full set. It is powered by USB from a power bank that sits in a pocket (power bank not included), so you choose how long it runs. Three settings cover about 77 to 131 °F (25 to 55 °C), and the extra-thick fleece lining keeps the warmth close even when the heat is off. Pick the men's or women's cut in black or gray, as a set, top only or pants only.

Why you'll love it

  • USB powered: Connect your own power bank in the pocket and press the button to start.
  • Three heat levels: Choose between about 77, 104 and 131 °F (25 to 55 °C).
  • Up to 22 zones: Twelve zones in the top and ten in the pants warm back, belly, knees and more.
  • Fleece lined: Thick 351 to 400 g/m2 fabric with a brushed inside for warmth without bulk.
  • Machine washable: Take out the power bank and wash the set as normal.

Perfect for: ice fishing, winter commutes, outdoor work, skiing and cold stadium seats.

Specifications
SKUCJYD187348602BY
VendorSigma Cum Laude
StyleMen's Set, Black, Men's Set, Gray, Women's Set, Black, Women's Set, Gray, Men's Top, Black, Men's Pants, Black, Men's Top, Gray, Men's Pants, Gray, Women's Top, Black, Women's Pants, Black, Women's Top, Gray, Women's Pants, Gray
SizeM, L, XL, 2XL, 3XL, 4XL, 5XL
Shipping & Returns

Free U.S. shipping on every order — no minimum. Small and light items ship via USPS Ground Advantage; Christmas trees, inflatables, oversized and fragile decor ship via FedEx Ground / FedEx Home Delivery. Orders are processed in 1–3 business days and tracking is emailed when your order ships.

Returns are free within 30 days of delivery: email us for an RMA and we will send a prepaid return label. Refunds are released within 7–10 business days after your return is received, inspected and accepted.

Full shipping policy · Full returns policy

Damage & Defects

Covered for 1 year against manufacturing defects, and damage in transit is covered in full when reported within 48 hours of delivery with photos.

Read the damage & defects policy

Sigma Cum Laude Heated Thermal Underwear with 22 Heating Zones, USB$137.70