xml.Unmarshal error: "expected element type <Item> but have <Items>"

I'm trying to unmarshal the following XML, but am receiving an error.

<ItemSearchResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2011-08-01">
<Items>
<Item>
<ASIN>B005XSS8VC</ASIN>
</Item>
</Items>

</ItemSearchResponse>

Here are my structs:

type Product struct {
	XMLName xml.Name `xml:"Item"`
	ASIN    string
}

type Result struct {
	XMLName  xml.Name `xml:"ItemSearchResponse"`
	Products []Product `xml:"Items"`
}

The text of the error is "expected element type <Item> but have <Items>," but I can't see where I'm going wrong. Any help is appreciated.

v := &Result{Products: nil}
err = xml.Unmarshal(xmlBody, v)

This works for me (note the Items>Item):

type Result struct {
XMLName       xml.Name `xml:"ItemSearchResponse"`
Products      []Product `xml:"Items>Item"`
}

type Product struct {
	ASIN   string `xml:"ASIN"`
}

The structure of the struct doesn't match with the xml structure, here is a working code:

package main

import (
	"encoding/xml"
	"log"
)

type Product struct {
	ASIN    string   `xml:"ASIN"`
}
type Items struct {
	Products    []Product `xml:"Item"`
}

type Result struct {
	XMLName  xml.Name `xml:"ItemSearchResponse"`
	Items    Items `xml:"Items"`
}

func main() {
	xmlBody := `<ItemSearchResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2011-08-01">
<Items>
<Item>
<ASIN>B005XSS8VC</ASIN>
</Item>
<Item>
<ASIN>C005XSS8VC</ASIN>
</Item>
</Items>`
	v := &Result{}
	err := xml.Unmarshal([]byte(xmlBody), v)
	log.Println(err)
	log.Printf("%+v", v)

}

it will output:

&{XMLName:{Space:http://webservices.amazon.com/AWSECommerceService/2011-08-01 Local:ItemSearchResponse} Products:{Products:[{ASIN:B005XSS8VC} {ASIN:C005XSS8VC}]}}