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 RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Gear Up, Stay Warm, and Own Winter Like a Pro!

BREATHE EASY STAY DRY - Advanced polyester-spandex blend wicks moisture fast, keeping you comfortable during intense outdoor sessions.
MOVE FREELY LOOK SHARP - Four-way stretch compression sculpts your silhouette and supports dynamic activity without restriction.
SEAMLESS COMFORT ALL DAY - Flatlock stitching eliminates chafing and bunching, so you forget you’re even wearing base layers.
STAY TOASTY WITHOUT THE BULK - Premium fleece lining traps heat while remaining lightweight—perfect for winter warriors.
VERSATILE COLD WEATHER ESSENTIAL - Ideal for skiing, hunting, cycling, or just conquering your daily grind in freezing temps.

HEROBIKER Long Johns Thermal Underwear Set combines ultra-soft fleece lining with breathable, sweat-wicking polyester-spandex fabric and four-way stretch technology. Designed for men who demand warmth, flexibility, and comfort during cold-weather activities like skiing, hunting, and cycling, this lightweight base layer features flatlock seams to prevent irritation and a slim fit that layers seamlessly under your gear.

Specifications

ASIN	B075WSFLDC
ASIN	B0HFJ2LTBB
Age Range Description	Adult
Apparel Closure Type	Pull On
Apparel Fabric Stretch	High Stretch
Apparel Fabric Weight Class	Lightweight
Best Sellers Rank	#45,096 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #7 in Men's Thermal Underwear Bottoms #89,077 in Women's Fashion
Brand Name	HEROBIKER
Collection Name	Winter
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (15,577)
Date First Available	September 25, 2017
Department	mens
Fabric Type	90% ultra-soft polyester 10% spandex
Fit Type	Regular
Fit to Size Sentiment	Positive
Garment Size Country	Mexico
Import Designation	Imported
Item Type Name	Base Layer
Item Weight	10.56 ounces
Manufacturer	HEROBIKER
Manufacturer Part Number	HEROBIKER
Material Type	Polyester
Neck Style	Crew Neck
Number of Items	2
Occasion Type	Skiing
Pattern	Solid
Product Care Instructions	Machine Wash
Size	Medium
Sleeve Length Description	Long Sleeve
Sleeve Type	Long Sleeve
Style Name	Classic
Style Number	MX 1001 M
UPC	756244705088
Unit Count	1 Count

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