Updated October 01, 2013.

Warmth is comforting -- especially for painful or stiff joints and muscles. Layering clothes adds warmth. Thermal underwear can be your first layer.

If you have arthritis, consider thermal underwear a necessity in your wardrobe. Here are a few styles for your consideration -- included for both men and women.

1. Cuddle Duds Black Thermal Pant

Comes in women's sizes. The material is 87% Polyester, 13% Spandex. Midweight fabric. Easy care thermal.More »

2. Cuddle Duds White Active Crew Thermal Shirt - L

Women's size. Material: 87% Polyester / 13% Spandex. Midweight fabric. Comfortable crew neckline.More »

3. P.J. Salvage Smiley Velour Thermal Leggings SMI-TSK Womens Large Ivory

Soft velour leggings with classic thermal long underwear construction. Comes with a faux fly and rib knit cuffs, and a smiley face print.More »

4. Hot Chillys Double Layer Thermal Pant (Women's) XL

Two layer knit polyester works to wick moisture and trap warm air. Relaxed fit with flat seams for comfort.More »

5. Duofold Men Insulayer Thermal Underwear

Merino wool blend outer layer and a soft 100% cotton inner layer form a two-layer thermal barrier.More »

6. Patagonia Men's Capilene 2 Bottoms

Open knit offers max breathability and moisture-management while still insulating on cold days.More »

7. Nike Therma-Fit Fleece Pant Men's Underwear

Therma-FIT fabric provides warm insulation and wind resistance, according to the manufacturer.More »