Can the seat (bottom) slide in or out, as in closer/further to the back rest?

Basically, yes. It's the backrest that moves in and out. I'd say moves closer/further or further/away 4 inches. It is done by four screws on the underside. On the contrary, the previous answer by Cody is the only other correct answer. The other answers are technically correct to the worded question; "seat...slide in or out..." but I know what you mean.

does headrest come off if you don't want it

The chair comes UN- assembled so just don't put it on. PS the position of the head rest if installed is so stupid it is not funny.

can I purchase the arm rest separately?

I don't know but I was looking to purchase a headrest for this chair and saw this question. I called the Staples brand support number given by SNP Innovation and they referred me to the parts supplier. The part supplier just sent me a free headrest since the chair is still under warranty. This is as of 1/3/18.

Staples Hyken Ergonomic Task Chair Mesh Ergonomic Lumbar Support Swivel

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Description

🖥️ Elevate your workspace comfort — because your productivity deserves the best seat in the house!

TAILOR YOUR THRONE - Fully adjustable seat height, arm position, and reclining resistance for personalized comfort.
ROLL WITH CONFIDENCE - Sturdy carpet casters and 250 lbs weight capacity for smooth mobility and reliable support.
STAY COOL STAY FOCUSED - High-back mesh upholstery ensures optimal airflow during marathon work or gaming sessions.
EFFORTLESS RECLINE CONTROL - Swivel-tilt mechanism with upright tilt lock and tension knob for seamless posture shifts.
BUILT TO LAST CERTIFIED SAFE - Meets ANSI/BIFMA standards guaranteeing durability and stability for daily use.

The STAPLES Hyken Ergonomic Task Chair combines customizable ergonomic adjustments, breathable mesh design, and certified durability to deliver a premium seating experience. Perfect for professionals seeking all-day comfort and support, it features adjustable height, armrests, reclining resistance, and smooth swivel mobility, supporting up to 250 lbs with ANSI/BIFMA safety certification.

Specifications

ASIN	B00OCSNMO2
Additional Features	Adjustable, Sturdy
Age Range Description	Adult
Arm Style	With arms
Assembly Instructions Description	Assembly required
Back Style	Mesh
Best Sellers Rank	#23,411 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #47 in Home Office Desk Chairs
Brand Name	STAPLES
Chair Backrest Width	16.42 Inches
Color	Black
Cushion Style	Boxed Edge
Customer Reviews	4.4 4.4 out of 5 stars (3,643)
Fabric Type	Mesh
Fill Material	Foam (Seat, Back), None (Arms)
Finish Types	Polished
Form Factor	Upholstered
Frame Material Type	Metal
Furniture Base Movement	Swivel
Furniture Finish	Aluminum
Global Trade Identification Number	00718103185745
Included Components	wheel
Indoor Outdoor Usage	Indoor
Is Customizable?	No
Is Foldable	No
Item Depth	27 inches
Item Dimensions	27 x 24 x 46 inches
Item Dimensions D x W x H	27.1"D x 27.95"W x 49.7"H
Item Type Name	Provides Lumbar, arm and Head Support, Perfect Desk Chair for the Modern Office
Item Weight	28.2 Pounds
Leg Style	Tapered Leg
Manufacturer	STAPLES
Manufacturer Part Number	STAPLES
Material Type	Black
Maximum Weight Recommendation	250 Pounds
Model Name	Hyken
Model Number	ST63305-CA
Pattern	Solid
Product Care Instructions	Wipe Clean
Reclining Position Count	At least 2
Recommended Uses For Product	Office
Required Assembly	Yes
Room Type	Office
Seat Depth	17.9 inches
Seat Height	21 Inches
Seat Material	Mesh
Set Name	Hyken
Shape	L-Shaped
Size	Hyken
Style Name	Hyken
Surface Recommendation	Carpet
Theme	Modern
Tilting	No
UPC	718103185745
Unit Count	1.0 Count
Upholstery Fabric Type	Mesh

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¥151096

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Good experience, but the tracking updates could be better.

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STAPLES Hyken Ergonomic Task Chair, Mesh, Ergonomic, Lumbar Support, Swivel, Black

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