Getting the right fit helps warmth and comfort. Here’s a quick approach:

• Check the size chart: Use your chest, waist, and hip measurements and compare them to the product’s chart on the page.
• Decide your fit: Many heated tops are designed as a snug base layer. If you prefer a more relaxed feel or plan to layer underneath, consider sizing up.
• Consider length: Look for notes on torso and sleeve length, especially for tall, petite, or plus sizes.
• Fabric stretch: Blends with spandex have more give than 100% polyester.
• Read reviews: Customer feedback can offer helpful fit tips.

When between sizes, a slightly looser fit can accommodate the battery pocket more comfortably.

They warm you in different ways:

• Heated underwear: Uses built-in heating zones powered by a 5V USB power bank or rechargeable battery. You can adjust heat levels for changing conditions.
• Regular thermals: Rely on insulation from materials like fleece, polyester, or wool blends to retain body heat without electronics.

Choose heated base layers for very cold days, longer outdoor time, or if you tend to get cold easily. Choose traditional thermals for everyday wear, mild-to-moderate cold, or when you prefer no battery/charging. Many shoppers pair both: a thermal base layer plus a heated mid-layer for flexible warmth.

Run time varies based on several factors:

• Battery capacity: Larger power banks generally run longer.
• Heat setting: Low typically lasts longer than medium or high.
• Heating zones: More zones can use more power.
• Conditions: Wind and very low temps may reduce run time.

Many product pages list estimated hours by setting—checking those details can help you plan. To extend time, pre-warm under a jacket, use lower settings after you’re warm, and consider carrying a spare compatible power bank. Some listings include a battery, while others don’t, so review “What’s included” and compatibility notes before purchasing.

Care instructions can vary, so always follow the garment’s label. In general:

1. Power off & remove the battery and any cables you can detach.
2. Protect connectors: Cap or tuck the USB lead to keep it dry.
3. Wash gently: Hand wash or use a cold, delicate cycle in a laundry bag with mild detergent. Avoid bleach and fabric softeners.
4. Air dry: Lay flat or hang to dry. Avoid high heat, ironing, and wringing.
5. Fully dry before use: Reconnect the battery only when the garment is completely dry.

These steps can help preserve the heating elements and fabric, but results may vary depending on specific materials and construction.

A few quick checks can help:

• Charge and compatibility: Make sure the power bank is charged and matches the garment’s 5V USB requirements.
• Connections: Seat plugs firmly; look for a light on the controller if your shirt has one.
• Power on correctly: Many require a long press (a few seconds) to start heating.
• Inspect wiring: Gently check for kinked or pinched cables and ensure the battery pocket sits flat.
• Layer up: Wear it as a base layer under a mid-layer to feel heat more effectively.

If it still doesn’t heat, review the manual on the product page and consider contacting support through your Walmart account for order assistance.