Do they enclose the ears or press against them? I can't tell how big they are.

With a center hole inside the padding of only about 1 & 3/4's inches around, these do not come close to enclosing my ears.

Will this headphone jack fit through the headphone jack on my iphone 5s life proof case?

Fits fine through my Otterbox Defender (iphne 5S)

Down the road, will 2-inch-diameter replacement foam earpads fit these Panasonic headphones?

I just measured them & they're actually oval, not circular. Approx dimensions are 2.25 x 1.75, so they're more than 2" at the longest dimension. You could try them, but more than likely, won't fit. Perhaps Panasonic sells some?

Will these work well outside brisk walk or running with an iPod?

We only use these on a computer, so I'm not sure how they'll function with movement. I can see them maybe working on a brisk walk, but they might be shaky for a run.

Panasonic Headphones On Ear Lightweight With Xbs Rp Ht21 Black

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

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Description

🎧 Elevate your everyday sound with lightweight power and bass that hits just right!

ERGONOMIC FIT - Wide headband and foam-cushioned earcups ensure premium comfort
EXTENDED REACH - 4.5-ft cord designed to move freely with your lifestyle
BASS THAT MOVES YOU - XBS port amplifies low frequencies for immersive audio impact
POWERFUL SOUNDSTAGE - 30mm neodymium drivers deliver rich bass and crystal-clear highs
FEATHERLIGHT COMFORT - Weighs just 1.2 ounces for all-day wear without fatigue

The Panasonic RP-HT21 on-ear headphones combine ultra-lightweight design (1.2 oz) with 30mm neodymium drivers and an XBS bass port to deliver rich, immersive sound. Featuring a wide ergonomic headband and foam-cushioned earcups, they provide all-day comfort. The 4.5-foot cord offers flexible connectivity for phones, laptops, and more, making these wired headphones a perfect blend of style, comfort, and powerful audio performance.

Specifications

ASIN	B00004T8R2
Additional Features	Noise Isolation
Age Range Description	ALL
Antenna Location	Music, Travel, Recording
Audio Driver Size	30 Millimeters
Audio Driver Type	Dynamic Driver
Battery Charge Time	16 Hours
Best Sellers Rank	#2,526 in Electronics ( See Top 100 in Electronics ) #238 in On-Ear Headphones
Brand Name	Panasonic
Built-In Media	Cable
Cable Features	Without Cable
Color	Black
Compatible Devices	Phones, Laptops, Music Production Equipment, Tablets
Connectivity Technology	Wired
Control Method	Remote
Customer Package Type	Standard Packaging
Customer Reviews	4.4 4.4 out of 5 stars (15,675)
Earpiece Shape	On-ear
Enclosure Material	Plastic
Frequency Range	16 Hz - 22,000 Hz
Frequency Response	22 KHz
Global Trade Identification Number	00012301986938, 00037988259052
Headphone Folding Features	On Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	On Ear
Impedance	30 Ohms
Is Autographed	No
Item Type Name	headphones
Item Weight	1.2 Ounces
Manufacturer	Panasonic
Model Name	RP HT21
Model Number	RP-HT21
Noise Control	None
Number of Items	1
Sensitivity	100 dB
Specific Uses For Product	personal
Style Name	On Ear - No Mic
UPC	163120595181 379882590528 182682341180 037988259052 100177326832 132017749488 689076738811 805095870770 804066527064 809185306859 069060216189 115970817241 012301986938 088037945464 112840387064 012307101014 675903999548 617407404531 012303529904 742996787564 808111645451 809385156292
Unit Count	1.0 Count
Warranty Description	90 days
Water Resistance Level	Not Water Resistant
Wireless Technology	WIRED

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