How contoured PORON shoe inserts work "like magic" to stop foot slide in high heels and flats, stabilize shoes and cushion the ball of the foot

January 02, 2019

How contoured PORON shoe inserts work "like magic" to stop foot slide in high heels and flats, stabilize shoes and cushion the ball of the foot

I saw a review an Amazon customer wrote for the Ball of Foot cushions that I sell on Amazon. She said they were "like magic". Other customers have said things like, "I didn't expect these to work but they did!" One customer said, " I was not sure about buying these shoe inserts because they look so small, how would they cushion my foot enough? ". 

I was inspired by these comments from customers to create a pictorial explanation of how the shoe inserts work to do the several thing they do to make shoes - flats or heels -  comfortable. 

A key characteristic of the shoe inserts are that they are made from PORON, which is an open cell  polyurethane foam that never flattens no matter how many times it is stepped on inside a shoe. It springs back faster than the naked eye can see. This rapid speed of rebound means that the foam will rebound back up to its full height between each step. When the spring of the foam is restored between each step it can cushion each footfall with the same comfort.  There is only one other shoe cushioning product sold for high heels that uses PORON. This is the 'Foot Petals' brand. Their ball of foot cushions and full length shoe insoles are made from flat sheets of PORON foam which can only act to cushion vertical pressure. Contoured PORON foam can act to cushion vertical pressure, resist horizontal pressure and stabilize the foot. Closed cell foam, such as memory foam made into shoe cushioning is only helpful for adding comfort until it flattens and becomes hard with no rebound. Gel shoe inserts have a very small amount of rebound but will feel hard underfoot especially after a long period of wear.  

Killer Heels Comfort high heel inserts and ball of foot cushions are made from contoured PORON foam that is shaped to fit the underside of the foot. The shaped foam forefoot piece (ball of foot cushion piece) has a 6 mm (1/4")  high toe grip that is fitted into a hollow under the three middle toes and a 4.5 mm domed cushion that fits under the ball of the foot centered on the underside of the middle metatarsal.

The forefoot cushion or ball of foot cushion is a one piece forefoot cushion that can be worn in flats or high heels. For additional comfort in high heels a second PORON cushion that fits into the arch at the front of the heel can be added to keep the heel of the foot in place inside the heel of the shoe.  The ball of foot cushion with its' toe grip also helps keep the heel of the foot at the heel end of the shoe by stopping the entire foot from sliding forward.

The material of the shoe cushion being PORON is very important for its' function in two ways. PORON rebounds upwards so it cushions the ball of the foot at each step with a fresh springy cushion plus PORON rebounds laterally so it stops the foot from sliding forwards because the toe grip maintains its shape and returns to its full height of 6 mm immediately after each step.

At each step the foot moves forward a small amount inside shoes. This happens in all shoe although it is most obvious in high heels which puts the foot on a sloped ramp where it slides forwards easily even while the wearer is standing still. If the toe grip was made from a foam such as 'memory foam' it would indent a small amount at each step and begin to flatten from the ball of foot side until it flattened entirely. At that point the foot would override the flattened foam piece and it would no longer be effective in stopping the forward slide of the foot. 

Foot comfort results from the combination of the material of the shoe cushion being PORON so it never crushes, the PORON material shaped into a raised toe grip that stops forward slide of the foot and the dynamics of the different parts of the shoe cushion. Additional foot comfort is due to the tapered front end of the shoe cushion design that preserves normal toes functions of propulsion and balance. It is easier and less tiring to walk in any style of shoes, especially high heels, if the big toe can push against the insole of the shoe to propel the foot and the little toe can push against the insole of the shoe to balance the foot.  

The shoe cushion is dynamic in that it is in a constant cycle of compression and rebound with each footfall and foot lift. When cushioning material under the ball of the foot compresses it does so at the exact moment that the foot begins to slide forward. The simultaneous compression of the material under the foot and the intact state of most of the toe grip at a height of 6 mm allows the toe grip to stop the foot from moving forward because of its relative height differential of 4.5 mm above the adjacent compressed material under the foot. When the foot is lifted up the height differential between the cushioning under the ball of the foot and the cushioning under the toes (the toe grip) is only 1.5 mm which would be too slight to stop the foot from sliding forwards. 

  It is because of the rebounding PORON material and the sculpted design of the inserts that makes it  possible for a tiny shoe insert that is 2.5" long and 1/4" high to keep back the weight of a person from sliding forward inside their shoes - even in high heels- cushion the ball of the foot under its' maximum pressure point and stabilize the foot inside a shoe to prevent wobbling and keep the heel of the foot in place. 

Leave a comment

Also in BLOG - COMFORT TIPS FOR HEELS & FLATS/ SHOE NEWS (click here to see all )

Will pretty slides be your new alt high heels? 4 helpful tips from customers for wearing your slides comfortably - and keeping them on your feet!
Will pretty slides be your new alt high heels? 4 helpful tips from customers for wearing your slides comfortably - and keeping them on your feet!

December 20, 2018 1 Comment

Can slides be your perfect alternative to wear instead of high heels with holiday dresses? Pretty party slides seem like the perfect solution to wear for the holidays, esp if you can't wear heels or have high heel pain. They look so comfortable!  But their dainty, pretty looks can be deceiving. It will not be the heel height that will cause trouble - it's their instability. Slides are shoes you can slide into and also slide out of backwards or slide off at the sides  -  even when you didn't intend to. 

Read More

5 tips for perfect fitting high heel shoes
5 tips for perfect fitting high heel shoes

December 01, 2018 1 Comment

 Even the most experienced high heel wearers - women who wear the most stylish coveted  brands of heels fitted exclusively for them - can have problems with their shoes.  Superstar Mariah Carey on an evening outing in Los Angeles can be seen with her feet slipping out of her high heel sandals.  High heel wearers'  everywhere can empathize with her. Problems with walking naturally in  heels, feet slipping forwards and pain in various parts of the feet are common issues with high heel shoes.  If you have these problems they will spoil the way you and your outfits look - nobody looks good hobbling in heels or grimacing in pain or with their toes hanging out  - but worse is that improperly fitted high heels can cause injuries from falls or lead to chronic foot pain.  There are rational steps you can take, and precautions you should follow,  to make your high heel heels comfortable to walk in and your feet pain free and protected from injury. 

Five tips for perfect fitting, no pain, high heels:

 1.  Buy shoes that fit. Buy high heels by matching the LENGTH of your foot in inches with a size chart, and then try on only those shoes and larger ones. 

 2. Outfit your high heels with contoured foam high heel inserts. 

 3.  Try out your high heels for at least ten minutes of walking about in the shoe store to make sure you can walk easily in them. 

4.  If you are buying spike heeled shoes make sure the heel end of the shoe does not wobble about when you walk and the shoes feel balanced.

5. Avoid buying high heel shoes with heels over 3.5” unless you intend to mostly sit while wearing them, and you will not be walking or standing for longer than 20 minutes without a rest period. 

Read More

BEST #1 to WORST #7 Ranking of High Heel Shoe Inserts & Insoles brands - by customers
BEST #1 to WORST #7 Ranking of High Heel Shoe Inserts & Insoles brands - by customers

October 31, 2018

The 'secret' to making sure you have the best chance of getting high heel shoe inserts that will work for you and give your foot maximum comfort is put them in heels that fit - never too tight - and choose inserts by the criteria of what is the softest and what you can customize as much as possible to fit according to your unique foot to cushion and stop forward slide.  Bonus if the inserts stabilize your high heels to stop wobbles.

Review the ranking of the Best and the Worst in high heel shoe cushioning. See if you can find the one you wear most often, and compare it to the other six.  

Read More