what is the material this beanie bopper is made of?

I am not sure what it’s made of. It is very soft to the touch and a it stretches. It fells like a cotton material.

Is this a long slouchy beanie or more of a short cap?

It's a skull cap that can cover the ears, but it also fits under a baseball cap, bicycle helmet, or acst as an extra layer under a larger woven toboggan or headcover. It's lightweight enough for spring weather, if you want to wear it alone. I wear it alone, as long as it's not too hot outside; or when it's cold, and I don't need a heavier head covering.

Do they tend to slide/ride up or hold the head steadily?

The beanie is comfortably snug, comes down partially over the ears, and doesn't ride-up or roll-up. It would take a very very strong wind to blow it off when cycling. I've worn it under baseball caps or knit caps for extra warmth. Fits nicely under your cycling or motorcycle helmets too!

Are these good for hot weather? I live in Las Vegas where it can get upwards of 110°.

I'd recommend it for keeping your head "warm." It would fit under a helmet, as another layer beneath a wool beanie, or hat in winter; but I'd find something lighter that breathes for climate that can reach up to 110°.

Mens Running Beanie Hat 9 Lightweight Helmet Liner Skull Cap

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥2678

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🏃‍♂️ Stay warm, stay sleek, stay ahead—your ultimate running beanie.

HELMET READY FIT - 9-inch depth and snug stretch fit comfortably under cycling, motorbike, or hard hats.
UNISEX UNIVERSAL - One size fits most (20.5-22.5 in), soft fabric for all-day comfort and style.
LIGHTWEIGHT YET WARM - Double-layer knit keeps you cozy without bulk or overheating.
SUN SMART PROTECTION - UPF 30+ shields your scalp during outdoor runs and rides.
VERSATILE ALL DAY WEAR - From casual beanie to helmet liner—seamlessly transition your look and function.

The EMPIRELION Men's Running Beanie is a 9-inch deep, lightweight, double-layer knit skull cap designed for active professionals. Crafted from a breathable 60% cotton and 40% polyester blend, it offers moisture-wicking comfort and UPF 30+ sun protection. Its slim, helmet-compatible fit makes it ideal for running, cycling, and outdoor sports, while its unisex design and stretch fabric ensure a snug, comfortable fit for head sizes 20.5 to 22.5 inches.

Specifications

ASIN	B07R3B5S3R
Additional Features	Breathable, Ear Warmer, Lightweight, Moisture Wicking, Sun Protection
Age Range Description	Adult
Apparel Closure Type	Pull-On
Apparel Fabric Stretch	Medium Stretch
Apparel Fabric Weight Class	Lightweight
Best Sellers Rank	#57,655 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #198 in Men's Skullies & Beanies
Brand Name	EMPIRELION
Care instructions	Machine Wash
Closure type	Pull-On
Color	Black
Customer Reviews	4.3 out of 5 stars 3,977 Reviews
Fabric Type	60% Cotton, 40% Polyester
Fabric type	60% Cotton, 40% Polyester
Fit Type	Fitted
Fit to Size Sentiment	Positive
Hat Form Type	Beanie
Import Designation	Imported
Is Waterproof	False
Item Dimensions	9 x 10 x 0.2 inches
Item Type Name	Beanie Hat
Manufacturer Part Number	EMP002
Material Type	Cotton Blend
Number of Items	1
Occasion Type	Birthday, Christmas, Easter, Father's Day, Halloween
Origin	Imported
Pattern	Solid
Pattern Style	Solid
Product Care Instructions	Machine Wash
Recommended Uses For Product	Sport, Travel
Seasons	All, Fall, Spring, Summer, Winter
Sport Type	Hiking, Running
Style Name	Thin Jersey Double Layer Snug Beanie Hats
Style Number	EMP002
Sun Protection	30 sun_protection_factor
Theme	Country
Ultraviolet Protection Factor	UPF 30
Unit Count	1 Count
Water Resistance Level	Not Water Resistant
character	Sports

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