Is this a top and bottom? shirt and pants?

Yes it’s a shirt and pants. You wear them uber your clothes to keep you warm. My husband says they are awesome and keeps him warm.

What size should I order if my boyfriend is a large shirt but usually a small/med in underwear

Just my opinion, I would get a Medium-Large. Pajamas are usually big for their stated size; however, you want more of a tight fit with thermal underwear as to keep the heat in, and usually warn under regular clothing. So I would say medium. Everything fits differently, but I would say the medium would be a better choice under a large shirt.

this is fleece lined?

It is not "fleece" material - however, the warmth is similar to that but is instead a form fitting base layer. I wear these under pants during New England winter temperatures and it is just as warm as smartwool. I also wear them under my motorcycle gear during this season too. These are a great product and worth way more than $20!

I wear 36 pants L but the size chart wierd what size do i get ? the chart size 3xl that big ?im L 36 help ?

Im 36 waist myself but my upper body is xxl because im 6'1" so is the size i gotten and it fits snugg all the way around because its stretchy material and here in new england its really cold and im in the snow clearing team , i luv this material it keeps me warm and dry ,hope this helps

Thermal Underwear For Men Long Johns Base Layer Fleece Lined

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Stay warm, move smart, and own the cold in style!

LAYER LIKE A PRO - Lightweight and slim fit design fits seamlessly under any outfit or sports gear.
BREATHE EASY STAY DRY - Advanced moisture-wicking fabric keeps you dry and comfortable during intense outdoor activities.
COZY MEETS PERFORMANCE - Fleece-lined interior delivers premium warmth without bulk—perfect for winter warriors.
MOVE FREELY STAY SLIM - 4-way stretch compression sculpts your silhouette while enabling unrestricted motion.
VERSATILE WINTER ESSENTIAL - Ideal for skiing, cycling, running, or just conquering cold commutes—your all-season base layer.

HEROBIKER Thermal Underwear for Men features a premium blend of 90% ultra-soft polyester and 10% spandex with fleece lining for superior warmth and comfort. Designed with 4-way stretch and flatlock seams, it offers excellent flexibility and a slim fit ideal for layering. Breathable and moisture-wicking, this lightweight base layer is perfect for a wide range of winter sports and outdoor activities.

Specifications

ASIN	B07MV88XZN
ASIN	B0HFJ2LTBB
Age Range Description	Adult
Apparel Closure Type	Pull On
Apparel Fabric Stretch	High Stretch
Apparel Fabric Weight Class	Lightweight
Best Sellers Rank	#41,408 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #9 in Men's Thermal Underwear Bottoms
Brand Name	HEROBIKER
Collection Name	Winter
Color	Grey
Customer Reviews	4.6 4.6 out of 5 stars (15,595)
Date First Available	September 25, 2017
Department	mens
Fabric Type	90% ultra-soft polyester 10% spandex
Fit Type	Regular
Fit to Size Sentiment	fits as expected
Garment Size Country	United States
Import Designation	Imported
Item Highlight	HEROBIKER Mens Lounge Set Moisture-Wicking, 4-Way Stretch. Ultra Soft Top Bottom Sleepwear Warm for Motorcycle Skiing Outdoor
Item Type Name	Base Layer
Manufacturer Part Number	..
Material Type	Polyester
Neck Style	Crew Neck
Number of Items	1
Occasion Type	Christmas
Pattern	Solid
Product Care Instructions	Machine Wash
Size	Medium
Sleeve Length Description	Long Sleeve
Sleeve Type	Long Sleeve
Style Name	Classic
Style Number	..
UPC	799670785620
Unit Count	1 Set

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