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.

Hokki Stool Flexible Ergonomic Seating 20 Blue

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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€ 616.51

Duties & taxes included

In stock

Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Move More, Think Better — The Stool That Keeps You Ahead

SLIP RESISTANT SAFETY - Soft base padding ensures secure, wobble-free seating during intense brainstorming.
DURABLE YET LIGHTWEIGHT - Polypropylene frame combines stability with easy portability at just 7 lbs.
BUILT TO LAST WITH WARRANTY - Backed by a 1-year limited warranty for peace of mind and long-term use.
ERGONOMIC DESIGN FOR ALL AGES - 20-inch seat height perfect for kids and adults alike, promoting healthy posture.
ACTIVE SITTING ACTIVE THINKING - Transforms sitting into dynamic movement to boost focus and creativity.

The Hokki VS America Stool is a 20-inch high ergonomic seating solution designed for kids and adults who crave active sitting. Featuring a unique convex base that allows 360-degree movement, it encourages physical activity to enhance intellectual focus and well-being. Crafted from durable polypropylene, it supports up to 242 lbs while remaining lightweight and easy to move. Ideal for dynamic workspaces and learning environments, this stool combines safety, comfort, and innovative design to keep you engaged and productive.

Specifications

ASIN	B005JZ81NE
Assembly Instructions Description	Basic assembly required. Instructions included.
Best Sellers Rank	#2,379,271 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #123 in Kids' Stools
Brand	Hokki
Brand Name	Hokki
Color	Blue
Customer Reviews	4.8 out of 5 stars 47 Reviews
Frame Material	Polypropylene (PP)
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 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
Product Dimensions	13.6"D x 13.6"W x 20"H
Required Assembly	No
Seat Height	20 Inches
Seat Material	Polypropylene (PP)
Seat Material Type	Polypropylene (PP)
Seat Width	13.5 Inches
Shape	Round
Size	20 inch
Style Name	Simple
UPC	783611447012
Unit Count	1.0 Count

Reviews

H**.

17.01.2015

J**E

19.06.2015

J**R

9.09.2016

J**Z

27.08.2013

D**7

14.12.2017

I**R

23.07.2015

J**Y

13.10.2015

J**R

16.10.2012

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€ 616.51

Duties & taxes included

In stock

Sold byAmazon FinlandDelivered 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 Finland.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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