Seamless Thermal Underwear Set – Ultra‑Thin 2‑Piece Long Johns…

A thermal base layer that earns its place under everything else in your drawer. Cut from an ultra-thin seamless fine-knit fabric with high elasticity, this two-piece set includes a long-sleeved scoop-neck top and matching full-length leggings in a form-fitting second-skin silhouette. The fabric layers invisibly under jeans, trousers, knit dresses, and oversized sweaters without bulk, while flat minimal seams at the neckline, cuffs, and waistband stay smooth against the skin.

Warmth without the volume. Layering without the lines.

Why you'll love it
• Ultra-thin seamless fine-knit — warmth without the bulk of traditional thermal wear
• High-elasticity fabric — moves with the body, recovers its shape after wear
• Long-sleeved top + full-length leggings — coordinated two-piece base layer
• Flat seams at neckline, cuffs, and waistband — smooth under fitted clothing
• Form-fitting second-skin silhouette — invisible under regular clothing

Perfect for
Cold-morning commutes when you need warmth without the visible bulk, layering under knit dresses and trousers through winter, weekend errands when the temperature drops mid-day, work-from-home days when the heating hasn't kicked in, or packing for a cold-weather trip where layering space is limited. A base-layer set that disappears into your wardrobe and shows up when the temperature drops.

Our promise
Designed by our intimates and base-layer team with input from pattern makers who specialize in second-skin fit. Reinforced stitching at every seam. 30-day hassle-free returns. Secure checkout. Built to keep its shape wash after wash.

Reliable Logistics Support: Receive Your Order in 3-14 DaysBrief Introduction

Enjoy reliable global shipping! Irene's Secret guarantees that your order will be safely delivered within 3 to 14 days. Track your package in real-time for peace of mind.

Irene's Secret is a professional and trustworthy team dedicated to providing high-quality lingerie.

Return Policy

Return Acceptance
We accept returns for both defective and non-defective products. However, exchanges are not accepted.

Product Eligibility
Only new products are eligible for return.

Return Window
Customers have 14 days from the date of receipt to initiate a return.

Return Method and Fees
Return Method: Returns must be made by mail. A return label is included in the package free of charge.
Restocking Fee: There is no restocking fee.

Refund Processing Time
Refunds will be processed within 7 days after we receive the returned item.