Foot Girth Girth with last

Several joints of the foot, the foot metatarsophalangeal joints key parts bent when walking, and it focuses and activities withstand the load if this part of the shoe size, shape, designed to be unreasonable, the shoes will be made Entire feature disadvantage. The first is wearing uncomfortable shoes also causing deformation, early breakage. Proper arrangements for plantar circumference size and rational design of the shape and dimensions of the Ministry of Man is also subject to the law and in accordance with foot movement of the foot, so that a high proportion of effective size of the area, it is guaranteed beautiful shape, comfortable for long life of One of the most important part. Because some should grasp metatarsophalangeal joint girth size and shape variation. Tarsal bone girth before, fighting with the girth is also true, to be introduced here together.from shoes manufacturer

Plantar foot circumference, around the size of the tarsus with long legs as affected by seasonal increase or decrease the effects of hot and cold, blood vessels in the legs when walking activity blood flow acceleration, feet transverse arch collapsed, has also led to an increase in girth size, sometimes more foot more significant increase in length, depending on the measurement, adult men and low temperatures due to plantar around the dimensional change is 3 ~ 8mm, and when the activity after a long walk around plantar length increased.

Again, plantar Wai Wai tarsal foot posture with its dimensions have also been various changes, such as standing foot girth measured 245mm, meditation only 239mm, narrow 6mm, and without weight measured when compared with floating 232mm, compared with standing girth narrow 13mm. Heel lifted off the ground plane also affects the level of plantar circumference, tarsal circumference size changes. According to measurements, height range in 50mm, 10mm plantar heel padded around each narrow 0.64mm, tarsal around narrow 0.95mm.

Wai Wai and tarsal plantar Another change is that it can fit a certain size tightening that can be worn over the foot plantar Wai Wai tarsal small size shoes do not feel any discomfort, feeling human foot plantar circumference reduction allowed compact dimensions, called plantar sensation around limits, the value obtained by the experiment, the man is 6mm, the woman is 2.08mm.

Know that these changes in the law long legs, you can list the shoe and foot metatarsophalangeal metatarsophalangeal girth girth relationship:
Shoe metatarsophalangeal metatarsophalangeal Girth = girth foot - feel Limits - heel height coefficient ± appropriate margin
This relationship can be designed according to last plantar circumference size, are for example as follows:
Men's leather shoe: palm heel height 25mm, medium soles around 247.39mm, the balance of plus 2.21mm;
    Last plantar circumference = 247.39-6-(0.64 × 2.5) +2.21 = 242mm
Women's shoes shoe: palm heel height 19mm, medium soles around 225.71mm, the balance of plus 0.42mm;
    Last plantar circumference = 225.71-2.08-(0.64 × 1.9)-0.42mm = 222mm

Here, "margin" is considering changes to the foot of the dynamic size and different types, varieties of shoes needs, as the foot feeling the thickness limit, including socks, shoes, workers and peasants, waist socks, boots, etc., taking into account the thickness to be increased, which a factor included in the plus margin, for example, male workers and peasants shoe (heel of high 4 ~ 6mm), its plantar circumference size 245mm, in addition to palm with highly different factors, the actual margin plus 5.21mm; female waist Boots (palm heel height 22mm) lasts plantar circumference size is 225mm, headroom plus 2.58mm. Margin size is appropriate, with the entire plantar lasts around the same, finally try to pass authentication can be determined.

Plantar foot circumference size for children dealing with the use of different from adults, because adults foot has been finalized, a children's foot still in the developmental stage, children's foot plantar circumference size increased with age and growth, according to the survey analysis foot, plantar foot circumference of children volume growth for the 6.4mm (girls and boys average), if, as the same way as an adult shoe plantar circumference size reduction, is bound to affect the normal development of children's feet, feet in order to protect the health of children, not only to reduce plantar circumference size but add fertilizer, age, Vietnam The larger the size of a small plus fertilizer, for example, in the plantar shoes lasts around 195mm, plantar foot circumference size greater than 4.32mm, small children's shoes last plantar around 175mm, plantar foot circumference size greater than 7.33mm.

In addition to these factors, the hardness of the material and thickness of the upper right to determine the size of shoe plantar around great impact with a hard, thick it is difficult to make the shoe upper leather wrapped around the foot evenly and often cause pain sensation , this plantar circumference size to increase; contrary, the use of easily match with a thin foot, stretching of the material to do to help, the last plantar circumference size can be slightly smaller. In short, the shoe last shoe type due to plantar circumference, variety and structure of shoes, upper material different sizes greater than or equal to the last foot plantar circumference size.from shoes factory

Tarsal circumference is an important dimension of the foot, around the size of the last tarsal, tarsal surface height width will cause unreasonable design when wearing shoes "pressure foot", not Genjiao, shoes deformation and so on. Tarsal circumference size sensible shoes, not only to tie the instep, sole hold, to keep their feet in the correct position, you can prevent the foot shift around too much, do not make shoes aliasing distortion against the foot, without prejudice to the foot blood circulation , let the foot skin worn so on. Tarsal surrounded in part by the up and down about four parts of the three-dimensional composition, are: the bottom of the foot nest inside the tarsal surface, lateral flanks, requirements according to the characteristics of different varieties reasonable arrangements for the parts of the last body to make the design of the shoe last production feet into the shoes wear clothes, walking after exercise feel comfortable shoes deformation is not obvious, so designers need to master the necessary data, and needs extensive practical experience. The last body shape data and combine to wear designed to meet the requirements of last tarsal around.

Tarsal laws around the foot plantar around with a certain relationship, shoe design that is the law, medium-size foot plantar tarsal Wai Wai bigger than 1 ~ 2mm, tarsal shoe around, too, when determining the size of shoe plantar post , last tarsal circumference than the plantar circumference size plus 1 ~ 2mm, shoe lasts for waist circumference size larger than the plantar tarsal around 2 ~ 5mm, in order to wear off shoes. Tarsal circumference size sensible shoes can correct tied feet north, in order to keep the heel in the correct position, and does not interfere with blood circulation, skin and respiratory air circulation inside the shoe, otherwise it will cause the feet early fatigue, and even pain and numbness in the feet. But with the heel height increases, the need for appropriate tarsal circumference decreases, for example on the 23rd (a semi) Women Pumps shoe 20mm heel height, the tarsal around 218.5mm, 30mm heel height, the tarsal circumference of 216.5mm, 40mm with high, tarsal circumference of 212mm, with up to 80mm high, tarsal circumference only 206mm, 80mm around the plantar heel is high, there is 217mm. The high heel shoe proved higher tarsal circumference smaller (see the specific shoe Data Sheet). With tarsal surrounded with high shrink is due to the higher heel, the more concave flanks, while the tarsal circumference area, on both sides of the body also requires more than low-heeled lean some, but not so low as tarsal back, which is the main small tarsal siege reasons, tarsal siege narrow purpose is to increase the height of the shoes does not control the forward displacement during walking, wear comfortable shoes is to ensure effective measures.

Pocket design with high waist girth is an important dimension of shoe last, time to wear off boots through this site, in addition to a large range of activities around the hind tibia, so the last pocket dimensions are larger than the circumference around the foot pocket size. According to measurements, pocket around the squat than the significant increase in the size of the stand, for example, when standing 321.95mm, squatting, compared 336.79mm, increase 14.84mm, so make sure pocket dimensions are larger than the circumference of the change factors must also be considered such as waist circumference size shoe lasts pocket men 350mm, large than the foot pocket around 23.4mm, woman, 324mm, than the foot pocket circumference greater than 21.3mm.

Long siege determine shoe size must also be taken to adapt them to changes in foot length group size, because for a number of shoe and shoe last fertility requirement is to adapt the same foot length group size and fertility groups, such as the 25th Medium ( IV) metatarsophalangeal shoe girth to fit metatarsophalangeal 244.9 ~ 250.9mm foot wear, so you can tighten the plantar tarsal Wai Wai and not a big problem, if the pocket siege also used the same method, there are a certain number of feet Model wearing a tight pocket around, so pocket circumference is surrounded by medium-sized foot pocket size limit to design, shoe pocket foot pocket Wai Wai than medium size increase the amount be greater. from men shoes manufacturer