what size would be right for a typical third grader?

Probably the 15-inch stool would work fine. However, kids grow so fast that maybe an 18-inch would be a better choice. My 5th grader LOVES it. Here is a link that might be helpful: https://www.wittfitt.com/products/hooki-stools/hokki.html

Does this stool give your abs a workout?

I would not classify the Hokki stool as workout equipment, but you are using core muscles to keep balanced therefore there is strengthening happening. So maybe abs are getting some workout.

Is this stool suitable for adults?

When ordering a Hokki stool, you need to be sure you are ordering the correct height. Your belly button should be at about the height of the desk top. This stool is absolutely wonderful for people who need to sit for long periods or have back problems. You will experience confort in your back with this stool as the sit bones are constantly given input to sit yourself erect. The moveemnt of the stool is also helpful for keeping your back happy. Mary (occupational therapist)

What is the top (the sitting surface) like? How cushioned is the sitting surface?

It is a non-slip surface, but not cushioned at all.

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Hokki VS America Stool Flexible Ergonomic Seating - 20" Blue

Hokki VS America Stool Flexible Ergonomic Seating - 20" Blue

Product ID: 3774024

Details

Brand
Hokki
Color
Blue
Frame Material
Polypropylene
Product Dimensions
13.6"D x x
Seat Material Type
Polypropylene

🌀360° flexible movement

🔵20-inch ergonomic height

⚖️Supports up to 242 lbs

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Description

🌀 Stay in motion, even when you’re still — the future of seating is here!

SLIP RESISTANT BASE - Soft padding ensures safety and stability during all-day brainstorming sessions.
SUPPORTS UP TO 242 LBS - Built tough for diverse users, combining comfort with robust performance.
DURABLE YET LIGHTWEIGHT - Polypropylene frame offers stability without the bulk—move it anywhere with ease.
ERGONOMIC 20 INCH HEIGHT - Perfectly designed for professional and creative workspaces to maintain posture.
ACTIVE SITTING ACTIVE MIND - Transforms sitting into dynamic movement to boost focus and creativity.

The Hokki VS America 20" Blue Stool is a modern ergonomic seating solution designed to encourage active sitting through its unique convex base that allows 360° movement. Crafted from durable polypropylene, it supports up to 242 lbs while remaining lightweight and portable. Ideal for professionals and creatives seeking to enhance focus and well-being, this stool features a slip-resistant base and a comfortable foam seat, making it perfect for dynamic work environments and brainstorming sessions.

Specifications

ASIN	B005JZ81NE
Assembly Instructions Description	Basic assembly required. Instructions included.
Best Sellers Rank	#1,664,531 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #90 in Kids' Stools
Brand Name	Hokki
Color	Blue
Customer Reviews	4.8 4.8 out of 5 stars (47)
Frame Material Type	Polypropylene (PP)
Furniture Finish	Plastic
Included Components	As Specified
Item Depth	5.35 inches
Item Dimensions	13.6 x 13.6 x 20 inches
Item Dimensions D x W x H	13.6"D x 13.6"W x 20"H
Item Length	13.6 inches
Item Weight	7 pounds
Leg Style	Splayed
Manufacturer	Hokki
Manufacturer Part Number	382520BLC02952B
Manufacturer Warranty Description	1 year limited warranty.
Material Type	Polypropylene
Maximum Weight Recommendation	242 pounds
Model Number	382520BLC02952B
Number of Items	1
Number of Pieces	1
Product Care Instructions	Spot or Wipe Clean
Seat Height	20 inches
Seat Material	Polypropylene (PP)
Seat Width	13.5 inches
Shape	Round
Size	20 inch
Style Name	Modern
UPC	783611447012
Unit Count	1 Count

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B/.952

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Panama.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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